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  1. #include <stdio.h>
  2. #include <string.h>
  3.  
  4. int count_letter(char *text, char letter) {
  5.     int sum = 0;
  6.     int len = strlen(text);
  7.  
  8.     for (int i = 0; i < len; i++) {
  9.         if (text[i] == letter || text[i] == letter + 32 || text[i] == letter - 32) {
  10.             sum++;
  11.         }
  12.     }
  13.  
  14.     return sum;
  15. }
  16.  
  17. int main() {
  18.     char text[1000];
  19.     char letter;
  20.  
  21.     printf("Введите текст: ");
  22.     fgets(text, 1000, stdin);
  23.  
  24.     printf("Введите букву для подсчета: ");
  25.     scanf("%c", &letter);
  26.  
  27.     int sum = count_letter(text, letter);
  28.  
  29.     printf("кол-во: %d\n", sum);
  30.  
  31.     return 0;
  32. }
Success #stdin #stdout 0s 5308KB
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stdin
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helllllll
l
stdout
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Введите текст: Введите букву для подсчета: кол-во: 7
https://ideone.com/Dw1JOl
language:
C (gcc 8.3)
created:
16 days ago
visibility:
public

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