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#include <stdio.h>
 
void swap(int &a, int &b){
	printf("%d %d\n", a, b);
		printf("%d %d\n", &a, &b);
 
	int temp=a;
	a=b;
	b=temp;
}
 
int main(void) {
	int a=2, b=5;
	printf("%d %d\n", a, b);
			printf("%d %d\n", &a, &b);
 
	swap(a,b);
	printf("%d %d\n", a, b);
	return 0;
}
 

prog.c:3:15: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void swap(int &a, int &b){
               ^
prog.c: In function ‘main’:
prog.c:15:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
    printf("%d %d\n", &a, &b);
    ^
prog.c:15:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘int *’ [-Wformat=]
prog.c:17:2: warning: implicit declaration of function ‘swap’ [-Wimplicit-function-declaration]
  swap(a,b);
  ^

Standard output is empty