fork download
copy 
  1. #include <stdio.h>
  2. #include <time.h>
  3. #include <stdlib.h>
  4.  
  5. long int A[8000][8000];
  6. long int B[8000][8000];
  7. long int total=0; 
  8. long int total1=0;
  9. long int x=(8000*8000);
  10. double Average, Average1;
  11.  
  12.  
  13. int main()
  14.  
  15. {
  16.    long int i, j;
  17.     clock_t start, stop;
  18.     float cpuSecs;
  19.      start = clock();
  20.  
  21.     for (i = 0; i < 8000; i++)
  22.     for (j = 0; j < 8000; j++)
  23.     A[i][j]=(rand()%100);  // random matrix generation ( square)
  24.  
  25.  
  26.     for (i = 0; i < 8000; i++)
  27.     for (j = 0; j < 8000; j++)
  28.  
  29.  
  30.     total=total+A[i][j];
  31.     Average=(double)total/x;
  32.     printf("Average of elements of matrix calculated in row major order is %lf\n", Average);
  33.  
  34.     stop = clock();
  35.     cpuSecs=((float)(stop-start))/CLOCKS_PER_SEC;
  36.     printf("CPU time for row major order is :%f\n",cpuSecs);
  37.  
  38.  
  39. 	start = clock();
  40.  
  41.     for (i = 0; i < 8000; i++)
  42.     for (j = 0; j < 8000; j++)
  43.     B[i][j]=(rand()%100);  // random matrix generation ( square)
  44.  
  45.  
  46.  
  47.     for (j = 0; j < 8000; j++)
  48.     for (i = 0; i < 8000; i++)
  49.  
  50.     total1=total1+B[i][j];
  51.     Average1=(double)total/x;
  52.     printf("Average of elements of matrix calculated in column major order is %lf\n", Average1);
  53.  
  54.     stop = clock();
  55.     cpuSecs=((float)(stop-start))/CLOCKS_PER_SEC;
  56.     printf("CPU time for column major order is :%f\n",cpuSecs);
  57.  
  58.  
  59.  
  60.  
  61.  
  62.  
  63.  
  64. }
  65.  
  66.  
Success #stdin #stdout 1.82s 1001616KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Average of elements of matrix calculated in row major order is 49.506548
CPU time for row major order is :0.813992
Average of elements of matrix calculated in column major order is 49.506548
CPU time for column major order is :0.996980
https://ideone.com/BfWfkF
language:
C (gcc 8.3)
created:
16 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!