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The following is an example of swapping two variables.

Example

#include <stdio.h>
int main() {
　　　int a, b;
　　　printf("Enter the value of a: ");
　　　scanf("%d", &a);
　　　printf("\nEnter the value of b: ");
　　　scanf("%d", &b);
　　　a　+= b　-= a = b　-　a;
　　　printf("\nAfter Swapping: %d	%d", a, b);
　　　return 0;
}

Output Result

Enter the value of a:　23
Enter the value of b:　43
After Swapping:　4323

In the above program, two variables a and b are declared and dynamically initialized at runtime.

int a, b;
printf("Enter the value of a: ");
scanf("%d", &a);
printf("\nEnter the value of b: ");
scanf("%d", &b);

No third variable is used when swapping numbers.

a　+= b　-= a = b　-　a;