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C Program to swap two numbers without third variable

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robaa
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2022-11-13
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We can swap two numbers without using third variable. There are two common ways to swap two numbers without using third variable:

  1. By + and -
  2. By * and /
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robaa
2022-11-13
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Program 1: Using + and -

Let's see a simple c example to swap two numbers without using third variable.

#include<stdio.h>  
 int main()    
{    
int a=10, b=20;      
printf("Before swap a=%d b=%d",a,b);      
a=a+b;//a=30 (10+20)    
b=a-b;//b=10 (30-20)    
a=a-b;//a=20 (30-10)    
printf("\nAfter swap a=%d b=%d",a,b);    
return 0;  
}

Output:

Before swap a=10 b=20
After swap a=20 b=10

 

Program 2: Using * and /

Let's see another example to swap two numbers using * and /.

#include<stdio.h>  
#include<stdlib.h>  
 int main()    
{    
int a=10, b=20;      
printf("Before swap a=%d b=%d",a,b);       
a=a*b;//a=200 (10*20)    
b=a/b;//b=10 (200/20)    
a=a/b;//a=20 (200/10)    
 system("cls");  
printf("\nAfter swap a=%d b=%d",a,b);       
return 0;  
}

Output:

Before swap a=10 b=20
After swap a=20 b=10

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