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#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>

void swap(int *a, int *b)
{

int *tmp = NULL;  

*tmp = *a;
*a = *b;
*b = *tmp;

}

int main( void)
{
int a, b;
a = 3;
b = 5;
printf(“a=%d\n b=%d\n”, a, b);
swab(&a, &b);
printf(“a=%d\nb=%d\n”, a, b);
system(“pause”);
}