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#include <stdio.h>
#include <stdlib.h>
//tmp() меняет местами
int* tmp(int &a, int &b)
{
    int tmp;
    tmp = a;
    a = b;
    b = tmp;
    return &a;//специально возвращаю адрес
}
void main(){
    int i,j;
    i=5;
    j=10;
    printf("i = %d \n",*tmp(i,j));
    printf("i = %d, j = %d \n", i, j);
    system("pause");
}

prog.c:4:14: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 int* tmp(int &a, int &b)
              ^
prog.c:12:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main(){
      ^
prog.c: In function ‘main’:
prog.c:16:5: warning: implicit declaration of function ‘tmp’ [-Wimplicit-function-declaration]
     printf("i = %d \n",*tmp(i,j));
     ^
prog.c:16:24: error: invalid type argument of unary ‘*’ (have ‘int’)
     printf("i = %d \n",*tmp(i,j));
                        ^

Standard output is empty