I was trying to manipulate matrices in my input file using functions. My input file is:

A 3 3
1 2 3
4 5 6
7 8 9
B 3 3
1 0 0
0 1 0
0 0 1
C 2 3
3 5 8
-1 -2 -3
D 3 5
0 0 0 1 0
1 0 1 0 1
0 1 0 0 1
E 1 1
10
F 3 10
1 0 2 0 3 0 4 0 5 0
0 2 3 -1 -3 -4 -3 8 3 7
0 0 0 4 6 5 8 2 -1 10

I am having trouble in implementing the functions that I declared. I assumed my program will perform those operations: transpose, negate, add, and multiply matices according to the users choice:

/* once this program is compiled and executed, it will perform the basic matrix
 * operations: negation, transpose, addition, and multiplication. */

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

#define MAX 10
int readmatrix(FILE *input, char martixname[6],int , mat[10][10], int i, int j);
void printmatrix(char matrixname[6], int mat[10][10], int i, int j);
void Negate(char matrixname[6], int mat[10][10], int i, int j);
void add(char matrixname[6], int mat[10][10],int i, int k);

void multiply(char matrixname[], int mat[][10], char A[], int i, int k);

void transpose (char matrixname[], int mat[][10], char A[], int);

void printT(int mat[][10], int);

int selctoption();

char selectmatrix();

int main(int argc, char *argv[])
{ char matrixtype[6];
  int mat[][10];
  FILE *filein;
  int size;
  int optionop;
  int matrixop;

  int option;
  if (argc != 2)
    { printf("Usage: executable input.\n");
      exit(0);
    }

  filein = fopen(argv[1], "r");
  if (!filein)
    { printf("ERROR: input file not found.\n");
      exit (0);
    }

  size = readmatrix (filein, matrixtype);
  printmatrix(matrix[][10], size);

  option = selectoption();
  matrixtype = selectmatrix();

  //printf("You have: %5.2f ", deposit);
  optionop = readmatrix(option, matrix[][10], size);

  if (choiceop == 6)
    { printf("Thanks for using the matrix operation program.\n");

      exit(0);
    }
  printf("Please select from the following matrix operations:\n")
  printf("\t1. Print matrix\n");
  printf("\t2. Negate matrix\n");
  printf("\t3. Transpose matrix\n");
  printf("\t4. Add matrices\n");
  printf("\t5. Multiply matrices\n");
  printf("\t6. Quit\n");
  fclose(filein);
  return 0;
}

do
{ printf("Please select option(1-%d):", optionop);
  scanf("%d", &matrixop);
} while(matrixop <= 0 || matrixop > optionop);

void readmatrix (FILE *in, int mat[][10], char A[], int i, int j)
{ int i=0,j = 0;
  while (fscanf(in, "%d", &mat[i][j]) != EOF)
 return 0;
}

// I would appreciate anyone's feedback.