title: ++group((int)(value[i])/10); what does it do..? in C
body: <p>This program is for calculating students marks frequency</p>
  
  <pre><code>float value[50];
  int group[11] = {0};
  
  for (i = 0; i &lt; 50; i++) {
  
      scanf("%f",&amp;value[i]); /* reading of values */
  
      ++group[(int)(value[i])/10)]; /* what does this line do.? */
  }
  </code></pre>