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C Program to swap two numbers without third variable || C Programs

Code -

#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

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