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  1. #include  <stdio.h>
  2. #define N 80
  3. char *fun (char tt[ ]);
  4. int main(void)
  5. {
  6.     char str[N];
  7.     printf("请输入一个字符串：\n");
  8.     gets(str);
  9.     printf("转换的结果是: %s\n", fun(str));
  10.     return 0;
  11. }
  12. char *fun (char tt[ ])
  13. {
  14.   char *ptt=tt;
  15.   while(*tt!='\0')
  16. {
  17.     if(*tt>'A'&&*tt<'Z')
  18.        {*tt=*tt+32;}
  19.      tt++;
  20.      return ptt;
  21. }
  22. }
Success #stdin #stdout 0s 5320KB
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stdin
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This
stdout
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请输入一个字符串：
转换的结果是: this
https://ideone.com/sDNXnM
language:
C (gcc 8.3)
created:
23 hours ago
visibility:
public

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