xt4-14已错.cpp

c++语言程序设计 谭浩强 例题及课后题源码.

#include <iostream>
using namespace std;                 
int main()
{char c;
 cin>>c;
 #if(c>='a'&&c<='z')
       c=c-32;
 #else                     
       c=c+32;
 #endif
 cout<<c<<endl;
 return 0;
}