I am taking in an input from a text file that looks something like this:
3 2 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 With the first line being the number of rows in matrix A stored in m, 2nd row being the number of columns in matrix A and number of rows in Matrix B stored in n, and 3rd row being the number of columns in matrix B stored in p.
I am grabbing the information from the text file using this function:
void read_matrices(int **A, int **B, int **C, int *m, int *n, int *p, char *file) { FILE *fp = fopen(file, "r"); if (!fp) { fprintf(stderr, "\n Error: file open failed for file '%s'\n\n", file); exit(0); } /* read & output m, n, p */ fscanf(fp, "%d\n%d\n%d\n", m, n, p); /* allocate memory for A and set values to null */ *A = (int*)calloc(*m * *n, sizeof(int)); /* read A */ int i, j; for (i = 0; i < *m; i++) { fscanf(fp, "\n"); for (j = 0; j < *n; j++) { fscanf(fp, "%d", (A + i * *n + j)); } } /* allocate memory for B and set values null */ *B = (int*)calloc(*n * *p, sizeof(int)); /* read B */ for (i = 0; i < *n; i++) { fscanf(fp, "\n"); for (j = 0; j < *p; j++) { fscanf(fp, "%d", (B + i * *p + j)); } } /* allocate memory for C and set values null */ *C = (int*)calloc(*m * *p, sizeof(int)); /* close FP & free allocated memory */ fclose(fp); } I am printing the matrix using the function:
void print_matrix(int *mtx, int r, int c) { int i, j; for (i = 0; i < r; i++) { printf("\n"); for (j = 0; j < c; j++) { printf("%5d", (mtx + i * c + j)); } } } When I print out the matrix's I am getting the wrong numbers out. But when I try printing inside the read function I get the correct result. I am getting the result:
Matrix A contents: 8 12 16 20 24 28 Matrix B contents: 7 11 15 19 23 27 31 35 Also when I change fscanf(fp, "%d", (A + i * *n + j)); to fscanf(fp, "%d", *(A + i * *n + j)); I get a Bus Error, but the way I have it now I get warning: int format, pointer arg.
