C++primer plus第六版课后编程题答案 6.1

6.1

#include <iostream>
//注意输入是ksngksjg234KJSG@skng这种情况
void main61()
{
using namespace std;
cout<<"Enter the string with the @ of the end:";
char arr[20];
//char *s=arr;
cin.getline(arr,20);
char ch;
ch=arr[0];
for(int i=0;i<20&&ch!='@';i++) //i<20保证数组不越界
{

if(ch>='A'&&ch<='Z')
cout<<char(ch+32);
else if(ch>='a'&&ch<='z')
cout<<char(ch-32);
else
cout<<ch;
ch=arr[i];
}
cout<<"\nOVER";
cin.get();
cin.get();

}