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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. int main(void) {
  5.     int counts[26] = {0};
  6.     int c;
  7.  
  8.     printf("Enter text (Press Ctrl+D or Ctrl+Z to end):\n");
  9.     while ((c = getchar()) != EOF) {
  10.         if (isalpha(c)) {
  11.             counts[tolower(c) - 'a']++;
  12.         }
  13.     }
  14.  
  15.     printf("\nLetter\tOccurrences\n");
  16.     for (int i = 0; i < 26; i++) {
  17.         printf("%c\t%d\n", 'a' + i, counts[i]);
  18.     }
  19.     return 0;
  20. }
Success #stdin #stdout 0s 5316KB
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stdin
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Standard input is empty
stdout
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Enter text (Press Ctrl+D or Ctrl+Z to end):

Letter	Occurrences
a	0
b	0
c	0
d	0
e	0
f	0
g	0
h	0
i	0
j	0
k	0
l	0
m	0
n	0
o	0
p	0
q	0
r	0
s	0
t	0
u	0
v	0
w	0
x	0
y	0
z	0
https://ideone.com/4sCp6L
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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