题解 | #字母大小写转换#
字母大小写转换
https://www.nowcoder.com/practice/850ebd30a2a34cfc87199da3fc15786a
#include <stdio.h>
#include <ctype.h>
int main()
{
char ch = 'a';
while (~scanf(" %c", &ch))
{
//判断是不是大写字母
if (isupper(ch))
{
//转小写
printf("%c\n",tolower(ch));
}else if(islower(ch))
{
//转大写
printf("%c\n",toupper(ch));
}
}
return 0;
}
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