C Program for Swapping two numbers without a temporary variable

Description:
   Two values can be swapped without the use of temporary variable.
 ex:
Let a=10, b=5
a=a+b=10+5=15
b=a-b=15-5=10
a=a-b=15-10=5
 thus, now a=5 and b=10

Source Code:
/*  
         Swapping of two variable without a temporary variable
            Author: sourcecodesonline.blogspot.com
*/
#include<stdio.h>
int main(void)
{

            int a,b;
            printf(“\nEnter the two numbers(a,b) to be swapped”);
            scanf(“%d%d”,&a,&b);
            a=a+b;
            b=a-b;
            a=a-b;
            printf(“Now the two numbers have been swapped a=%d b=%d”,a,b);
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