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  1. #include <stdio.h>
  2. #include <ctype.h>
  3.  
  4. int main(void) {
  5.     char c;
  6.     printf("Enter a character: ");
  7.     scanf("%c", &c);
  8.  
  9.     printf("isdigit('%c') = %d\n", c, isdigit(c));
  10.     printf("isalpha('%c') = %d\n", c, isalpha(c));
  11.     printf("isalnum('%c') = %d\n", c, isalnum(c));
  12.     printf("isxdigit('%c') = %d\n", c, isxdigit(c));
  13.     printf("islower('%c') = %d\n", c, islower(c));
  14.     printf("isupper('%c') = %d\n", c, isupper(c));
  15.     printf("isspace('%c') = %d\n", c, isspace(c));
  16.     printf("iscntrl('%c') = %d\n", c, iscntrl(c));
  17.     printf("ispunct('%c') = %d\n", c, ispunct(c));
  18.     printf("isprint('%c') = %d\n", c, isprint(c));
  19.     printf("isgraph('%c') = %d\n", c, isgraph(c));
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 5292KB
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stdin
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Standard input is empty
stdout
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Enter a character: isdigit('') = 0
isalpha('') = 0
isalnum('') = 0
isxdigit('') = 0
islower('') = 0
isupper('') = 0
isspace('') = 0
iscntrl('') = 2
ispunct('') = 0
isprint('') = 0
isgraph('') = 0
https://ideone.com/yOGFq8
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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