Thread: New to C, seg fault

I can't figure out why this would cause a segmentation fault if n < MAXROWS. I'm pretty sure my array bounds are fine as well. Any ideas?

Code:

#include <stdio.h>
#include <stdlib.h>

#define TOLERANCE 1E-6
#define MAXROWS 100
#define MAXCOLS 101

void printMatrix(int rows, int columns, double matrix[][MAXCOLS]);

int main()
{
        double matrix[MAXROWS][MAXCOLS];

        int n;

        scanf("%d\n", &n);

        if(n < 1){
                printf("Expected N (number of equations)\n");
                exit(0);
        }
        int i, j;

        for(i = 0; i < n; i++){
                for(j = 0; j < n+1; j++){
                        int readVal = scanf("%lf", matrix[i][j]);
                        if(readVal < 1){
                                printf("Element a[%d][%d] is missing\n", i, j);
                                exit(0);
                        }
                }
        }

Don't you get any compiler warnings about that?

Code:

int readVal = scanf("%lf", &matrix[i][j]);

Just like I thought, a dumb newb mistake. Thanks guys!

Originally Posted by Subsonics

Don't you get any compiler warnings about that?

Code:

int readVal = scanf("%lf", &matrix[i][j]);

nope

Originally Posted by Manske

nope

Too bad.

You need to turn up your compiler warnings then.