<swustoj>?id=563 String

链接http://acm.swust.edu.cn/problem/563/

#include <stdio.h> 
#include <string.h>
int main()
{
    char str[105];
    while(scanf("%s",str)!=EOF)
    {
        int leng = strlen(str),i;
        for(i = 0 ; i< leng ; i ++)
        {
        if(str[i]>='a'&&str[i]<='z')
        {
            str[i]=str[i]-32;
        }
        else if(str[i]>='A'&&str[i]<='Z')
        {
            str[i]=str[i]+32;
              
        }
        }
        printf("%s\n",str);
    }
    return 0;
}