Ошибка в элементарной программе

#include <cstdio>
#include <cstdlib>
#include <conio.h>
 
using namespace std;
 
int main()
{
int equal;
int user_equal;
int num1;
int num2;
num1=rand() % 100+1;
num2=rand() % 100+1;
equal=num1+num2;
printf("%d + %d =", num1,num2);
scanf("%d",&user_equal);
if(equal==user_equal) printf("Right answer! Now we know, You are not robbot!");
else printf("Wrong answer! Equal=%d",equal);
_getch();
return 0;
}

scanf_s("%d",&user_equal);

#include <iostream>
#include <conio.h>
 
int main()
{
    int equal;
    int user_equal;
    int num1;
    int num2;
    num1=rand() % 100+1;
    num2=rand() % 100+1;
    equal=num1+num2;
    printf("%d + %d =", num1,num2);
    scanf("%d",&user_equal);
    if(equal==user_equal) printf("Right answer! Now we know, You are not robbot!");
    else printf("Wrong answer! Equal=%d",equal);
    _getch();
    return 0;
}

#define _CRT_SECURE_NO_WARNINGS