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  1. #include  <stdio.h>
  2. #define N 80
  3. int main(void)
  4. {
  5.     char str[N];
  6.     int i=0;
  7.     printf("请输入一个字符串：\n");
  8.     gets(str);
  9.     while(str[i]!='\0')
  10.     {
  11.         if((str[i]>='A')&&(str[i]<='Z'))
  12.          {str[i]=str[i]+32;}   
  13.         i++;
  14.     }
  15.     printf("转换的结果是: %s\n", str);
  16.     return 0;
  17. }
Success #stdin #stdout 0.01s 5324KB
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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/P5kaLr
language:
C (gcc 8.3)
created:
11 hours ago
visibility:
public

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