紫书P45 例题3-1

一、题意

输入一篇文章，把左右引号" "分别替换为 ``和 ' '。

二、解析

边输入边判断，然后边输出即可。

三、代码

#include 
#include 
using namespace std;
int main(){
    char ch;
    const string q[2] = {"``", "''"};
    int idx = 0;
    while((ch = getchar()) != EOF) {
        if(ch == '"') cout << q[idx], idx = (idx + 1) % 2;
        else cout << ch;
    }
}
/*
"To be or not to be," quoth the Bard, "that
is the question".
The programming contestant replied: "I must disagree.
To `C' or not to `C', that is The Question!"
*/

四、归纳

  • 字符输入：getchar() 不要用cin
  • 字符文尾判断： ch != EOF
  • ps： 输出字符：putchar()

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