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bitarno 11-07-2008 07:43 PM
C++ Help
 
hey guys i'd like to receive some help by some programs in C++ thanks

I use Visual C++ so i hope the code would be convenient


1st Excersice

Write a complete C++ code in which you develop a function to compute n factorial
N factorial = n! = 1*2*3*…*n
In this code, you read the value of n from the user and you pass it to the function.


2nd Exercise

Consider the following series
x(n) = 1/n + 1/(n-1) + … + 1 for all n > 0
x(1) = 1
Develop a recursive function to compute the value of x(n)


3rd Exercise

Write a C++ code that generates a random number between -10 and +15

( this one we should use rand()%... something like that )


Thx Guys in advance :D
more to come later



Sheriff Ice 11-07-2008 08:20 PM
Re: C++ Help
 
PM me i have them:p i solved them the first year of uni

i still have the solution on a word file :p

and i can give you an e-book that it may help you

Google 11-07-2008 10:13 PM
Re: C++ Help
 
Quote:
Originally Posted by icemaker (Post 158066)
PM me i have them:p i solved them the first year of uni

i still have the solution on a word file :p

and i can give you an e-book that it may help you
Why not posting them here, so we can all benefit :p

Quote:
more to come later
Waiting for this more :p
Bring us shi desem :p

Kingroudy 11-07-2008 10:25 PM
Re: C++ Help
 
1st exercise:
int n, nf=1;
cin>>n;
for(int i=1; i<=n, i++)
{
nf*=i;
}
cout<<nf

hayda L base taba3 L code.. it has been a full year i haven't touched c++, and i have an exam tomorrow so i can't stay long for this.

Sheriff Ice 11-08-2008 09:59 AM
Re: C++ Help
 
Quote:
Originally Posted by Edgard Chammas (Post 158092)
Why not posting them here, so we can all benefit :p


Waiting for this more :p
Bring us shi desem :p
Ill post them :p ma te3tal ham

just give me till afternoon i am at work ill post them as i get home

bitarno 11-08-2008 12:02 PM
Re: C++ Help
 
I want also a code for a program to change a number entered by a user into binary

Google 11-08-2008 02:32 PM
Re: C++ Help
 
Decimal to Binary Converter:

Code:
#include <iostream.h>
void binary(int);
void main() {
    int number;
    cout << "Enter a positive integer: ";
    cin >> number;
    if (number < 0)
        cout << "The number must be positive you idiot!\n";
    else {
        cout << number << " is ";
        binary(number);
        cout<<" in binary.\n\n";
    }
}
void binary(int n) {
    int rem;
    if(n <= 1) {
        cout << n;
        return;
    }
    rem = n%2;
    binary(n >> 1);   
    cout << rem;
}

Tawa 11-08-2008 04:40 PM
Re: C++ Help
 
Quote:
Originally Posted by bitarno (Post 158053)

2nd Exercise

Consider the following series
x(n) = 1/n + 1/(n-1) + … + 1 for all n > 0
x(1) = 1
Develop a recursive function to compute the value of x(n)
Code:
#include <iotream>
using namespace std;

double function(int);

int main(void)
{
    int n;
    double x;

    do{
        cout << "Enter n: ";
        cin >> n;
    }while(n<1);
   
    x = function(n);

    cout << "X(n) = " << x << endl;

    return 0;
}

double function(int n)
{
    if(n == 1)
        return 1;
    return 1/n + function(n-1);
}

Damn I Miss The C++ :p

Sheriff Ice 11-08-2008 07:05 PM
Re: C++ Help
 
Code:
1.23
 
  #include<iostream>
  using namespace std;
  int main()
  {
            int x,y;
            cout<<"enter your first integer:\n";
            cin>>x;
            cout<<endl<<"enter your second integer:\n";
            cin>>y;
            cout<<endl<<"the sum is:  "<<x+y<<endl<<"the product is:  "<<x*y<<endl<<"the difference is:  "<<x-y<<endl<<"the quotion is:  "<<x/y<<endl;
            return 0;
  }
 
  1.24
 
  #include<iostream>
  using namespace std;
  int main()
  {
            int x;
            x=0;
            if(x<=4)
            cout<<x;
            return 0;
  }
 
  1.25
 
  #include<iostream>
  using namespace std;
  int main()
  {
            int x,y;
            cout<<"enter your first integer; \n";
            cin>>x;
            cout<<endl<<"enter your second integer; \n";
            cin>>y;
            cout<<endl;
            if(x>y)
                    cout<<x<<" is larger"<<endl;
            else if(y>x)
                    cout<<y<<" is larger"<<endl;
            else if(x==y)
                    cout<<"these number are equal  "<<x<<" = "<<y<<endl;
            return 0;
  }
 
 
 
 
  1.26
 
  #include<iostream>
  using namespace std;
  int main()
  {
            int x,y,z,sum,ave,pro;
            cout<<"Input three different integers: ";
            cin>>x>>y>>z;
            sum=x+y+z;
                    cout<<"sum is "<<sum<<endl;
                    ave=(x+y+z)/3;
                              cout<<"average is "<<ave<<endl;
                    pro=x*y*z;
                    cout<<"product is "<<pro<<endl;
            return 0;
  }
 
  1.30
 
  #include<iostream>
  using namespace std;
  int main()
  {
            int a,b,c,d,e;
            cout<<"enter the 5 values:\n";
                    cin>>a>>b>>c>>d>>e;
            if(a<b,a<c,a<d,a<e)
                    cout<<"the smallest "<<a<<endl;
            else if(b<a,b<c,b<d,b<e)
                    cout<<"the samallest "<<b<<endl;
            else if(c<a,c<b,c<d,c<e)
                    cout<<"the smallest "<<c<<endl;
            else if(d<a,d<b,d<c,d<e)
                    cout<<"the smallest "<<d<<endl;
            else 
                    cout<<"the smallest "<<e<<endl;
  }
  {
            if(a>b,a>c,a>d,a>e)
                    cout<<"the largest "<<a<<endl;
            else if(b>a,b>c,b>d,b>e)
                    cout<<"the largest "<<b<<endl;
            else if(d>a,d>b,d>c,d>e)
                    cout<<"the largest "<<d<<endl;
            else if(c>a,c>b,c>d,c>e)
                    cout<<"the largest "<<c<<endl;
            else
                    cout<<"the largest "<<e<<endl;
            return 0;
  }
 
  1.31
 
  #include<iostream>
  using namespace std;
  int main()
  {
            int x,y;
            cout<<"enter your integer: \n";
            cin>>x;
            if(x%2)
                    cout<<x<<" is even\n";
            else
                    cout<<x<<" is odd\n";
            cout<<"enter your integer \n";
            cin>>y;
            if(y%2)
                    cout<<y<<" is even\n";
            else
                      cout<<x<<" is odd\n";
            return 0;
  }
 
  1.32:
  x 1.32:
 
  #include <iostream>
  using namespace std;
  int main()
  {
            int x,y;
            cout<<"Enter two integers\n";
      cin>>x>>y;
            if (x%y==0)
                    cout<<x<<"is multiple of"<<y;
            return 0;
  }

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EX:2.16:
  #include<iostream> //chapter 2 ex2.16
  using namespace std;
  int main()
  {
            double galon,mil,total,m,ave;
            m=0;
            total=0;
            cout<<"enter the gallons used, -1 to end: \n";
            cin>>galon;
            while(galon!=-1)
            {
                    total=total+galon;
                    cout<<"enter miles driven: \n";
                    cin>>mil;
                    m=m+mil;
                    cout<<"the miles/gallons for this tank was "<<mil/galon; //average for one entry
                    cout<<endl<<"enter the gallons used, -1 to end: \n";
                    cin>>galon;
            }
            ave=(m/total);
            cout<<"the overall average is: "<<ave<<endl; //the overall average.
            return 0;
  }
  Ex:2.17:
 
  #include<iostream>
  #include<iomanip>
  using namespace std;
  int main()
  {
            int an;
            double bb,tc,cr,cl,b;
            cout<<"Enter the account number: (-1 to end)"<<endl;
            cin>>an;
            while(an!=-1)
            {
                    cout<<"Enter the beginning balance: "<<endl;
                    cin>>bb;
                    cout<<endl<<"Enter total charges:"<<endl;
                    cin>>tc;
                    cout<<endl<<"Enter total credits: "<<endl;
                    cin>>cr;
                    cout<<endl<<"Enter credit limit: "<<endl;
                    cin>>cl;
                    cout<<endl;
                    b=bb+tc-cr;
                    if(b>=cl)
                    {
                              cout<<"Account"<<setw(8)<<an<<endl;
                              cout<<"credit limit"<<setw(4)<<cl<<endl;
                              cout<<"Balance"<<setw(8)<<b<<endl;
                              cout<<"Credit limit exceeded"<<endl;
                    }
                    cout<<endl<<endl;
                    cout<<"enter the account number: (-1 to end)"<<endl;
                    cin>>an;
            }
            return 0;
  }
 
 
 
 
  Ex:2.18:
  #include<iostream>//exercise2.18 page 160
  using namespace std;
  int main()
  {
            int ws;
            double sales,total,commission;
            ws=200;
            cout<<"enter sales in dollars (-1 to end):"<<endl;
            cin>>sales;
            while(sales!=-1)
            {
                    commission=(9*sales)/100;
                    total=ws+commission;
                    cout<<"salary is: $"<<total<<endl<<endl;
                    cout<<"enter sales in dollars (-1 to end):"<<endl;
                cin>>sales;
            }
            return 0;
  }
 
  Ex:2.19:
  #include<iostream>
  using namespace std;
  int main()
  {
            int hours,ratelow,extra;
            double ratehigh,bonus;;
            cout<<"enter hours worked (-1 to end)\n";
                    cin>>hours;
            while(hours!=-1)
            {
                      cout<<"enter hourly rate of the worker($00.00): "<<endl;
                    cin>>ratelow;
                    ratehigh=ratelow*1.5;
                    if(hours>40)
                    {
                              extra=hours-40;
                              bonus=extra*ratehigh;
                              cout<<"the salary is:$"<<bonus+40*ratelow<<endl;
                    }
                    else
                              cout<<"the salary is:$"<<hours*ratelow<<endl<<endl;
                    cout<<"enter hours worked (-1 to end)"<<endl;
                    cin>>hours;
            }
            return 0;
  }
 
  Ex:2.20:
  #include<iostream>
  using namespace std;
  int main()
  {
            int counter=0,number=0,large=0;
            cout<<"enter number of sold objects\n";
            cin>>number;
            while(counter<=10)
            {
                    counter=counter+1;
                    if(number>=large)large=number;
                    cout<<"enter the number of sold objects\n";
                    cin>>number;
            }
            cout<<"the most sold is "<<large;
            return 0;
  }
 
  Ex:2.21:
  #include<iostream>
  using namespace std;
  int main()
  {
            int x;
            x=1;
            cout<<"N\t10*N\t100*N\t1000*N\n\n";
            while(x<=5)
            {
                    cout<<x<<"\t"<<x*10<<"\t"<<x*100<<"\t"<<x*1000<<endl;x++;
            }
            return 0;
  }


    problem 1:
 
  #include <iostream>
  using namespace std;
  void prime(int,int);
  int main()
  {
              int a,b;
    cout<<"enter the domain between 2 numbers u need to find the prime numbers:"<<endl;
    cin>>a>>b;
    prime(a,b);
    return 0;
  }
   
   
    void prime(int a,int b)
    {
    int i;
    int num=0;
 
    for (int j=a;j<=b;j++)
    {
        num=num+1;
 
        for (i=2; i<num; i++)
        {
            if((num%i)==0)
            {
                break;
            }
           
        }
 
        if (i >= num)
        {
            cout<<num<<endl;
        }
    }
    }
 
  problem 2
 
  #include <iostream>
  #include <cmath>
  using namespace std;
  int main()
  {
  const int maxNumb = 10000;
  int sum, largestFactor, divisor;
  double started, ended;
  for (int lcv = 2; lcv < maxNumb; ++lcv)
  {
  sum = 1;
  largestFactor = (int)sqrt((double)lcv);
  for (divisor = 2; divisor <= largestFactor; ++divisor)
  {
  if (lcv % divisor == 0)
  {
  sum += divisor;
  if (divisor * divisor != lcv)
  sum += (lcv / divisor);
  }
  if (sum > lcv) break;
  }
  if (sum == lcv) cout << lcv << endl;
  }
 
  return 0;
  }
 
  problem 4
 
  #include<iostream>
  #include<cstdlib>
  using namespace std;
  int main()
  {
              int x,y,z,a;
              while(a!=-1)
              {
              x=(1+rand() %9);
              y=(1+rand() %9);
              z=x*y;
              cout<<"how much is "<<x<<" times "<<y<<" ?"<<endl;
                          cin>>a;
              while (a!=z)
              {
                          cout<<endl<<"No, plz try again"<<endl;
                          cin>>a;
              }
 
                          cout<<"very good"<<endl;
                          cout<<"enter -1 to exit or any number to continue";
                          cin>>a;
              }
              return 0;
  }
 
 
  problem 5
 
  #include<iostream>
  #include<cstdlib>
  using namespace std;
  int main()
  {
              int x,y; char c;
              cout<<"want to play (y or n)"<<endl;
              cin>>c;
              while(c==y)
              {
              x=(1+rand()%1000);
              cout<<"i have a number between 1 and 1000."<<endl;
              cout<<"can you guess my number?"<<endl;
              cout<<"please type ur first guess"<<endl;
              cin>>y;
              while(y!=x)
              {
              if(y<=(x-10))
                          cout<<"Too low. Try again."<<endl;
              else if(y<x)
                          cout<<"almost there."<<endl;
              else if(y>=(x+10))
                          cout<<"too high. Try again."<<endl;
              else if(y>10)
                          cout<<"almost there."<<endl;
              cin>>y;
              }
              cout<<"excellent! you guessed the number!"<<endl;
              cout<<"would you like to play again (y or n)?";
              cin>>c;
              }
              return 0;
  }
 
 
 
  problem 6
 
  #include<iostream>
  #include<iomanip>
  #include<cstdlib>
  using namespace std;
  int main()
  {
              int tim1=0,tim2=0,tim3=0,tim4=0,tim5=0,tim6=0,face;
              for(int roll=1;roll<=6000;roll++)
              {
                          face=1+rand()%6;
                                      switch (face)
                          {
                                      case 1:
                                                  ++tim1;
                                                  break;
                                      case 2:
                                                  ++tim2;
                                                  break;
                                      case 3:
                                                  ++tim3;
                                                  break;
                                      case 4:
                                                  ++tim4;
                                                  break;
                                      case 5:
                                                  ++tim5;
                                                  break;
                                      case 6:
                                                  ++tim6;
                                                  break;
                                      default :
                                                  cout<<"program should never get here!";
                          }
              }
              cout<<"Face"<<setw(15)<<"Times"
                          <<"\n  1"<<setw(15)<<tim1
                          <<"\n  2"<<setw(15)<<tim2
                          <<"\n  3"<<setw(15)<<tim3
                          <<"\n  4"<<setw(15)<<tim4
                          <<"\n  5"<<setw(15)<<tim5
                          <<"\n  6"<<setw(15)<<tim6<<endl;
              return 0;
  }
 
  problem 11
 
  #include<iostream>
  using namespace std;
  void draw_ESquare(int,char);
  int main ()
  {
              int l;char c;
              cout<<"enter the character the lenght of your square: \n";
              cin>>c>>l;
              cout<<endl;
              draw_ESquare(l,c);
 
              return 0;
  }
 
  void draw_ESquare(int l, char c)
  {
                          for(int i=1;i<=l;i++)
              {
                          for(int j=1;j<=l;j++)
                                      if(i==1||j==l)
                                                  cout<<c;
                                      else cout<<" ";
                                      cout<<endl;
              }
  }
sorry i dont have the questions but if u read each example u will know what it do

these are the exercises that i found

i still have two e-books

c++ ill post them later by tonight

bitarno 11-26-2008 06:04 PM
Re: C++ Help
 
Guys New Updates :


Arrays

Develop a C++ code where you declare an array of 50 elements. After assigning random values to your array, you need to compute the Mean, Median and Mode.
1.Mean
  • Average (sum/number of elements)
2.Median
  • Number in middle of sorted list
  • 1, 2, 3, 4, 5 (3 is median)
  • If even number of elements, take average of middle two
3.Mode
  • Number that occurs most often
  • 1, 1, 1, 2, 3, 3, 4, 5 (1 is mode)

2D Arrays

Exercise 1

Develop a C++ code where you declare a 2 dimensional array A of 50 rows and 30 columns.
1.Develop a function that assigns random values to your array. Each random value r should satisfy the following relation: -120 < r < 100 or r > 300.

2.Develop a function that generates a new array B in which you store the average of the elements stored over the same column in array A

Exercise 2

There are three students and there have been 4 quizzes. The results are
·first student got 77, 68, 86, 73
·second student got 96, 87, 89, 78
·third student got 70, 90, 86, 81

Goal
1.Develop a function that prints the grades of students
2.Develop a function that finds the highest grade
3.Develop a function that finds the lowest grade
4.Develop a function that computes the average of each student

Hint:
Use a multiple-subscripted array (table)
·Rows are students
Columns are grades
Strings
EXERCISE 1
Develop a function that reads a string, removes all space from that string and prints out the result on the screen.
Example: read “hello there” and produce “hellothere”
  • Redo the same thing for an array of characters.
EXERCISE 2
Develop a function that reads a string, replaces all letters “e” by “a” and prints out the result on the screen
Example: read “hello there” and produce “hallo thara”
  • Redo the same thing for an array of characters.

EXERCISE 3
Develop a function that reads a string, finds the most repeated letter, and prints out the result on the screen.
Example: read “hello there” and produce “e” is the most repeated lettre
  • Redo the same thing for an array of characters.

EXERCISE 4
Develop a function that reads a string and prints it backwards on the screen.
Example: read “hello there” and produce “ereht olleh”
  • Redo the same thing for an array of characters.

EXERCISE 5
Write a myStrlen function which is the same as the library strlen function.
  • Redo the same thing for an array of characters.

EXERCISE 6
Write the myStrcpy function which is the same as the library strcpy function.
  • Redo the same thing for an array of characters.

EXERCISE 7
Write the myStrNcpy function which is the same as the library strncpy function.
  • Redo the same thing for an array of characters.

EXERCISE 8
Write the myStrcmp function which is the same as the library strcmp function.
  • Redo the same thing for an array of characters.

EXERCISE 9
Write the myStrNcmp function which is the same as the library strncmp function.
  • Redo the same thing for an array of characters.
EXERCISE 10
Write a program that reads a line from the keyboard, and stores that line in a string.
a.Develop a function that allows you to insert a word wherever you want in that string.
b.Develop a function that allows you to delete any word of that string.
  • Redo the same thing for an array of characters.

Thx Alot Guys ... Remember Visual C++ compiler :D


Neoxter 11-26-2008 08:14 PM
Re: C++ Help
 
sorry,but u cant learn it if someone else is doing if for you ,u have to experience it yourself.

Tawa 11-26-2008 08:38 PM
Re: C++ Help
 
I Totally Agree With Neoxter, You Just Gave Us 13 Exercises :S How Are You Gonna Learn If You Don't Do Them Yourself?

bitarno 11-26-2008 09:03 PM
Re: C++ Help
 
Well Edgard Helped me with the 1st one w ba3d 3ane2 taweel it worked :D
and ill do the rest alone i guess lol :(

jak 11-26-2008 09:38 PM
Re: C++ Help
 
i totally agree with Neoxter and Tawa... u have to exercise to c++ wa illa u wont get anywhere... believe me i used to be like you and i changed major kilo min wara c++ :p

im now workin on vb... likin it much more than c++


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