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int main() {
	int i, n, sum=0, mul=0;
 
	printf("Ingresa n:\n");
	scanf("%d", &n);
 
	for(i=1; i<n; i++) {
		mul=n%i;
		if(mul==0) {
			sum+=i;
		}
	}
	if(sum==num){
		printf("El numero %d SI es perfecto.\n", n);
	}
	else
	printf("El numero %d NO es perfecto.\n", n);
	return 0;
}

prog.c: In function 'main':
prog.c:4:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("Ingresa n:\n");
  ^
prog.c:4:2: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:4:2: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:5:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d", &n);
  ^
prog.c:5:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:5:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:13:10: error: 'num' undeclared (first use in this function)
  if(sum==num){
          ^
prog.c:13:10: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty