Need help understanding this code as I need to trace a modified version of it on my exam.

[dusk heath]

#include <stdio.h>
#include <ctype.h>
int main() {
int index, freq[26], c, stars, maxfreq;
for (index=0; index<26; index++)
freq[index] = 0;
while ( (c = getchar()) != '7') {
if (isalpha(c))
freq[tolower(c)-'a']++;
}
maxfreq = freq[25];
for (index = 24; index >= 0; index--) {
if (freq[index] > maxfreq)
maxfreq = freq[index];
}
printf("a b c d e f\n");
for (index=0; index<5; index++) {
for (stars=0; stars< (maxfreq - freq[index]); stars++)
printf(" ");
for (stars=0; stars< (freq[index]); stars++)
printf("*");
printf("%c \n", ('A' + index) );
printf(" \n");
}
return 0;
}

I dont understand what is happening (Assumed input is aaBBcc*c7)

[quasi raven]

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[sand gyro]

!f

[quasi raven]

#include <ctype.h>
#include <stdio.h>
int main() {
  int index, freq[26], c, stars, maxfreq;
  for (index = 0; index < 26; index++)
    freq[index] = 0;
  while ((c = getchar()) != '7') {
    if (isalpha(c))
      freq[tolower(c) - 'a']++;
  }
  maxfreq = freq[25];
  for (index = 24; index >= 0; index--) {
    if (freq[index] > maxfreq)
      maxfreq = freq[index];
  }
  printf("a b c d e f\n");
  for (index = 0; index < 5; index++) {
    for (stars = 0; stars < (maxfreq - freq[index]); stars++)
      printf(" ");
    for (stars = 0; stars < (freq[index]); stars++)
      printf("*");
    printf("%c  \n", ('A' + index));
    printf(" \n");
  }
  return 0;
}

I dont understand what is happening (Assumed input is aaBBcc*c7)

Luger

Formatted by Zelis

[sand gyro]

What's your current understanding of it

[quasi raven]

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