Reading a file to matrix in C -

i

"debug assertion failed"

error when try compile code.

can please explain wrong it? think i've done wrong fscanf function. thank you.

#include<stdio.h> #include<stdlib.h> #include<malloc.h> void input(file *fp, int **a,int m) {     int i,j;     for(i=0;i<m;i++)     {         for(j=0;j<m;j++)         {             fscanf(fp, "%d\n", *(a+i)+j);         }     } }  int main() {     file*fp;     int m,n,**a,i,j;     scanf("%d",&m);     fp=fopen("abc.txt","r");     a=(int**)malloc(m*sizeof(int*));     for(i=0;i<m;i++)         *(a+i)=(int*)malloc(m*sizeof(int));     input(fp,a,m);     for(i=0;i<m;i++)     {         for(j=0;j<m;j++)         {             printf("%d ",*((a+i)+j));         }         printf("\n");     }     free(a);     return 0; } 

there several issues here, directly answer question, not providing address fscanf() store integer finds.

without knowing intent, i'll give example:

fscanf( fp, "%d\n", &(a[i]) ); 

that says ith element of array a 1 (over)written. if a[i] int pointer, might pass &( (a[i])[j] ) in there.

also, think meant replace:

*(a+i)=(int*)malloc(m*sizeof(int)); 

with

a[i] = (int*) malloc(m*sizeof(int));