having problems reading data into a C program

Hockeyfan · 05-24-2004, 04:03 PM

I am rewriting all my programs that I wrote in Java while I was in school in C and C++ so that I am comfortable writing in these languages.

My problem is that I am getting a segmentation fault in my program after I do a scanf. I am not sure what I am doing wrong. It has been about 3 years since I have programmed in C.

Here is the code:

Code:

#include <stdio.h>

int main (void)
{
     int num1, num2, num3, num4;
     double dub1, dub2, dub3, dub4;
     char char1, char2, char3;

      scanf("%d, %d, %d, %d", num1, num2, num3, num4);
      printf( "%d\n", num1);
      
      return 0;
}

I have tried debugging the program and changing the variables to pointers. None of these solutions worked. I know it must be a simple thing bukt I am missing it. Any help would be appreciated.

Hockeyfan

infamous41md · 05-24-2004, 04:07 PM

you need to pass the address of each of those variables.

scanf("%d, %d, %d, %d", &num1, &num2, &num3, &num4);

u said u tried pointers, i assume u mean this:

int *num1, *num2, *num3, *num4;

those pointers dont actually point into valid memory, same as in java when u do this:

my_object foo;

u have to allocate foo before u use it, same as in C/C++.

Hockeyfan · 05-24-2004, 04:51 PM

Thanks for the help, I knew it was something simple.