#include<stdio.h>
int main(
void)
{
char ch;
printf("input characters:");
ch=
getchar();
while(ch!=
'\n'){
if(ch>=
'A'&&ch<=
'Z')
ch=ch-
'A'+
'a';
else if(ch>=
'a'&&ch<=
'z')
ch=ch-
'a'+
'A';
putchar(ch);
ch=
getchar();
}
return 0;
}
转载于:https://www.cnblogs.com/liruijia199531/p/3357474.html
