Sum & Avg. of elements of a matrix.c

#include<stdio.h>
int main()
{
	int i,j,m,n,sum=0,avg=0;
	printf("Enter Number Of Rows : ");
	scanf("%d",&m);
	printf("Enter Number Of Columns : ");
	scanf("%d",&n);
	int matrix[m][n];
	printf("Enter Matrix Elements : ");
	for(i=0;i<m;i++)
		for(j=0;j<n;j++)
			scanf("%d",&matrix[i][j]);		
	for(i=0;i<m;i++)
		for(j=0;j<n;j++)
			sum=sum+matrix[i][j];
	avg=sum/(m*n);
	printf("\nSum Of All Elements In Matrix = %d",sum);
	printf("\nAverage Of Matrix = %d",avg);
	return 0;
}
//code for matrix multiplication
#include <stdio.h>
 
int main()
{
  int m, n, p, q, c, d, k, sum = 0;
  int first[10][10], second[10][10], multiply[10][10];
 
  printf("Enter number of rows and columns of first matrix\n");
  scanf("%d%d", &m, &n);
  printf("Enter elements of first matrix\n");
 
  for (c = 0; c < m; c++)
    for (d = 0; d < n; d++)
      scanf("%d", &first[c][d]);
 
  printf("Enter number of rows and columns of second matrix\n");
  scanf("%d%d", &p, &q);
 
  if (n != p)
    printf("The multiplication isn't possible.\n");
  else
  {
    printf("Enter elements of second matrix\n");
 
    for (c = 0; c < p; c++)
      for (d = 0; d < q; d++)
        scanf("%d", &second[c][d]);
 
    for (c = 0; c < m; c++) {
      for (d = 0; d < q; d++) {
        for (k = 0; k < p; k++) {
          sum = sum + first[c][k]*second[k][d];
        }
 
        multiply[c][d] = sum;
        sum = 0;
      }
    }
 
    printf("Product of the matrices:\n");
 
    for (c = 0; c < m; c++) {
      for (d = 0; d < q; d++)
        printf("%d\t", multiply[c][d]);
 
      printf("\n");
    }
  }
 
  return 0;
}