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  1. #include<stdio.h>
  2. #include<ctype.h>
  3. int main()
  4. {
  5.     char d[256], *p;
  6.     printf("文字列を入力してください > ");
  7.     fgets(d, sizeof(d), stdin);
  8.     p = d;
  9.     do {
  10.         if (isupper(*p))
  11.             *p = tolower(*p);
  12.         else if (islower(*p))
  13.             *p = toupper(*p);
  14.     } while (*p++);
  15.     printf("変換文字列 = %s\n", d);
  16.     return 0;
  17. }
  18.  
Success #stdin #stdout 0s 2164KB
comments (?)
stdin
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The C languege
stdout
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文字列を入力してください > 変換文字列 = tHE c LANGUEGE
https://ideone.com/KTH7Hg
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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