Need help with a little problem with pointers.

[raxan]

Hi, I'm new here and relatively new to the C language.

Anyway I'll get straight to the point.
I'm working on an assignment ( no I am not asking anyone to help me complete it), it is basically a Launderette system and I'm encountering a slight problem when i tried to use pointers.

The program stopped working at a certain point which i commented.

Here is the coding:

....
float handWash(){


    int numOfHWash;
    float hWashTotal;
    float price_hWash = 5;


    printf("\nEach item hand washed will be RM%.2f", price_hWash);
    printf("\n\nEnter number of clothes to be hand washed: ");
    scanf("%d", &numOfHWash);


    hWashTotal = numOfHWash*price_hWash;


    serviceType(&hWashTotal);
	
    printf("\n\nThe total cost is: RM%.2f", hWashTotal);
}

....

void serviceType(float *svcCost){


    int sType_input;


    printf("\n\n");
    printf("1. Regular Service: 30%% Discount.\n");
    printf("2. Express Service: 50%% Extra Charge.\n");
    printf("Enter the service type: ");
    scanf("%d", sType_input);
   
   //the program stopped working after receiving the input
    if(sType_input == 1)
        *svcCost = *svcCost * 0.7;
    else
        *svcCost = *svcCost * 1.5;
}

So after I entered 1 or 2, a little window would pop up saying the program would stop working.

I tried removing the scanf() and leaving only one statement.
The program when I did and I could work around it to make it so but I want to know why and hoping that there might be a solution to this?
Perhaps any advice?

Thanks in advance and sorry if I broke any rules

[jimblumberg]

For scanf() you need to supply the address of the variable, you need an ampersand.

Jim

[anduril462]

scanf("%d", &numOfHWash);

scanf("%d", sType_input);

Notice any difference between those two? One of them is missing something.

[raxan]

Thank you jimblumberg and anduril462, I should have opened my eyes a little bigger.
As stupid as I am feeling right now, I think I'll never forget to put '&'.

Thank you