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  1. #include <stdio.h>
  2. #include <ctype.h> 
  3.  
  4. void count_chars(const char *s, int *letter, int *digit, int *space, int *other) {
  5.     *letter = 0;
  6.     *digit = 0;
  7.     *space = 0;
  8.     *other = 0;
  9.     while (*s != '\0') {
  10.         if (isalpha(*s)) {
  11.             (*letter)++;
  12.         } else if (isdigit(*s)) {
  13.             (*digit)++;
  14.         } else if (isspace(*s)) { 
  15.             (*space)++;
  16.         } else {
  17.             (*other)++;
  18.         }
  19.         s++;
  20.     }
  21. }
  22.  
  23. int main() {
  24.     char s[100];
  25.     printf("请输入字符串：");
  26.     getchar(); 
  27.     gets(s);   
  28.  
  29.     int letter, digit, space, other;
  30.     count_chars(s, &letter, &digit, &space, &other);
  31.  
  32.     printf("字母个数：%d\n", letter);
  33.     printf("数字个数：%d\n", digit);
  34.     printf("空格个数：%d\n", space);
  35.     printf("其他字符个数：%d\n", other);
  36.  
  37.     return 0;
  38. }
Success #stdin #stdout 0s 5288KB
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vi58fh
stdout
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请输入字符串：字母个数：3
数字个数：2
空格个数：0
其他字符个数：0
https://ideone.com/4lQ54V
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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