Question

• Make a program that swaps the three values.
  • Three integer values are taken from the user input.
    • This work will be done by calling the function "getinput(num1, num2, num3)"
  • The input values are swapped each other by calling the function swap(num1, num2, num3)
    • example: values (a, b, c) will be (c, a, b) after the swap.
      • a = 10; b = 20; c = 30;
      • after function call,
        • a has 30, b has 10, and c has 20.

Answer 1

Code:

#include <iostream>
using namespace std;

void getinput(int &a,int &b,int &c){
  //get value of a,b,c from user
  cout<<"Enter value of a : ";
  cin>>a;

  cout<<"Enter value of b : ";
  cin>>b;

  cout<<"Enter value of c : ";
  cin>>c;
}
void swap(int &a,int &b,int &c)
{ 
    // Store sum of all in a 
    a = a + b + c;
    // After this, b has value of a 
    b = a - (b+c);
    // After this, c has value of b 
    c = a - (b+c);  
    // After this, a has value of c 
    a = a - (b+c);
} 

int main() {
  int a,b,c; 

  getinput(a,b,c);
  swap(a,b,c);

  //after swaping three variable
  printf("\n---After swap function called---\n\n");
  
  //print variable
  printf("Value of a : %d\n",a);
  printf("Value of b : %d\n",b);
  printf("Value of c : %d\n",c);
}

Output: