Expression result pointer nullptr ошибка

I am writing a C++ program to search for a given integer in array, however, when I try to debug the program, visual studio ( I am using vs 2015 pro version) complains about a debug assertion failure:
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Here is my code, its pretty straightforward:

int main() {
int searchArray[10] = { 324,4567,6789,5421345,7,65,8965,12,342,485 };
//use searchKey for the number to be found
//use location for the array index of the found value
int searchKey, location;

//write code to determine if integers entered by 
//the user are in searchArray
//initiate searchKey and location
searchKey = 0;
location = 0;
int n = sizeof(searchArray) / sizeof(searchArray[0]);
//let user define the search key, give -1 to quit
while (true)
{
    std::cout << "Enter an integer ('-1') to quit: ";
    scanf_s("%d", searchKey);
    std::cout << searchKey << "n";
    if (searchKey == -1)
    {
        break;
    }
    for (location; location < n; location++)
    {
        if (searchArray[location] == searchKey)
        {
            break;
        }
        location = -1;
    }
    if (location != -1)
    {
        std::cout << searchKey << " is at location " << location << " in the array.n";
    }
    else
    {
        std::cout << searchKey << " is not in the array.n";
    }
}
return 0;
}

int main() {
int searchArray[10] = { 324,4567,6789,5421345,7,65,8965,12,342,485 };
//use searchKey for the number to be found
//use location for the array index of the found value
int searchKey, location;

//write code to determine if integers entered by
//the user are in searchArray
//initiate searchKey and location
searchKey = 0;
location = 0;
int n = sizeof(searchArray) / sizeof(searchArray[0]);
//let user define the search key, give -1 to quit
while (true)
{
std::cout << "Enter an integer ('-1') to quit: ";
scanf_s("%d", searchKey);
std::cout << searchKey << "n";
if (searchKey == -1)
{
break;
}
for (location; location < n; location++)
{
if (searchArray[location] == searchKey)
{
break;
}
location = -1;
}
if (location != -1)
{
std::cout << searchKey << " is at location " << location << " in the array.n";
}
else
{
std::cout << searchKey << " is not in the array.n";
}
}
return 0;
}

Решение

scanf_s("%d", &searchKey);

Другие решения

Других решений пока нет …

There’s some problem with the ‘calculate the total’ part but I’m unsure what it is. Everything else runs fine besides it.. I get the «result_pointer != nullptr» error everytime.

void CalculateTotal(double pricePerGallon, double* totalPtr)

//input price per gallon
//declare, ask and get the number of gallons
//calculate the total
//input/output parameter for the total

{
//declare, ask and get the number of gallons
int numGal = 0;
double tot;
printf("Enter the number of gallons requested: ");
scanf("%d", numGal);

//calculate the total
tot = numGal * pricePerGallon;
*totalPtr = tot;

printf("Your total is %f.", totalPtr);
 }

unsure if it matters, but I called it in another function definition like so:

CalculateTotal(itemNumber, &total);

(I’m just learning programming for my class, so the simpler the explanation, the better. This is not C++ btw, just C.)

I’m working on this c code in visual studio 2015, and I keep getting this error message after the first scanf input. It’s something I’ve never seen before and I was hoping I could get some help with figuring out what I am doing wrong. Anything will help, thank you. I’ll post my code in the comments if it will help.