co_4, C (gcc) - rextester

co_4

#include <stdio.h>
 #include<stdlib.h>
#include<time.h> 
int main()
{
	 FILE* fp;
    fp=fopen("m.csv","w");
    for(int size=1;size<=700;size+=5){
                    int N=size;
                    double time;
                    clock_t start;
  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 matrices can't be multiplied with each other.\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");
    }
  }
 time= (double)(clock()-start)/(CLOCKS_PER_SEC*5);
                    printf("\n%d\n Time:%.12f\n\n",size,time);
                    fprintf(fp,"%d,%d,%d,%.12f\n",N,N*N,3*N*N,time);
        }
        fclose(fp);
  return 0;
}


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