C语言 通过指针传参改变两个整数的值

//接受a,b的地址
void swap(int* pa,int* pb){
	int tmp = 0;
	tmp = *pa;
	*pa = *pb;
	*pb = tmp;
}
int main(){
	int a = 10;
	int b = 20;
	printf("a=%d,b=%dn",a,b);
	swap(&a,&b);//传a,b的地址
	printf("a=%d,b=%d",a,b);
	return 0;
}