输入一个大写A就变成小写a,输入小写a则相反

输入一个大写A就变成小写a,输入小写a则相反

#include
#include
using namespace std;
int main() {
char c;
cout << “请输入一个字母” << endl;
cin >> c;

if (c >= 'a' && c <= 'z') {
	c -= 32;
	cout <<"值为"<< c << endl;
}else if (c >= 'A' && c <= 'Z') {
	c += 32;
	cout << c << endl;
}else {
	cout << "输入错误" << endl;
}

system("pause");
return 0;

}