Write a program equivalent to a four-function calculator. The program should request a user to enter a number, an operator, and another number.

It should then carry out the specified arithmetical operation: adding, subtracting, dividing, or multiplying two numbers (Use the concept of function add(), sub(),…).

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Source Code,

/*program by using four function to calculate the sum, div, mul, and dif*/
#include<iostream.h>
#include<conio.h>
void sum(int x, char ch, int y);
void dif(int x, char ch, int y);
void div(int x, char ch, int y);
void mul(int x, char ch, int y);
void main()
{
  int x, y;
  char ch;
  cout<<"Enter First Number:";
  cin>>x;
  cout<<"Enter character:";
  cin>>ch;
  cout<<"Enter Second Number:";
  cin>>y;
  switch(ch)
  {
      case '+':
      {
        sum(x,ch,y);
        break;
      }
      case '-':
      {
        dif(x,ch,y);
        break;
      }
      case '/':
      {
        div(x,ch,y);
        break;
      }
      case'*':
      {
        mul(x,ch,y);
        break;
      }
      default:
      {
        cout<<"Wrong Choice";
        break;
      }
  }
  getch();
}
void sum(int x, char ch, int y)
{
    int a;
    a=x+y;
    cout<<"Result is:"<<a;
}
void dif(int x, char ch, int y)
{
    int d;
    d=x-y;
    cout<<"Result is:"<<d;
}
void div(int x, char ch, int y)
{
    int di;
    di=x/y;
    cout<<"Result is:"<<di;
}
void mul(int x, char ch, int y)
{
    int m;
    m=x*y;
    cout<<"Result is:"<<m;
}

Output:

Enter First Number:3
Enter character:+
Enter Second Number:3
Result is:6