C++ primer plus(第六版）学习笔记、习题答案（4.2）

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还以为博客没有了，就不添到上一篇了

5_8（1）

// 2014/12/11#include <iostream>#include <cstring>using namespace std;int main(){char test[20] = {0};int count = 0;char ch;int i = 0;cout << "Enter words(to stop ,type the word done):";do{i = 0;ch = cin.get();while (ch != ' ' && ch != '\n'){test[i++] = ch;ch = cin.get();}test[i] = '\0';count ++;}while (strcmp(test,"done") != 0);cout << "you entered a total of " << count -1 << " words.";cin.get();cin.get();cin.get();return 0; }

note:程序有个小bug，只输入一个空格，或者回车也会当做一个字符来看待。

后来改了一下

5.8（2）

// 2014/12/10#include <iostream>#include <cstring>using namespace std;int main(){char test[20] = {0};int count = 0;char ch;int i = 0;cout << "Enter words(to stop ,type the word done):";do{i = 0;ch = cin.get();while (ch != ' ' && ch != '\n'){test[i++] = ch;ch = cin.get();}//avoid enter the blank or enter the first timetest[i] = '\0';if (strcmp(test,"\0") != 0){count ++;}}while (strcmp(test,"done") != 0);cout << "you entered a total of " << count -1 << " words.";//cin.get();cin.get();cin.get();return 0; }

5.9

// 2014/12/11#include<iostream>#include<string>using namespace std;int main(){const string str = "done";string test;int i = 0;cout << "Enter words (to stop, type the word done)";do {cin >> test;if (test != str){i++;}elsebreak;} while (true);cout << "you entered a total of " << i << "words";cin.get();cin.get();return 0;}

5.10

// 2014/12/11#include<iostream>#include<string>using namespace std;int main(){int n;cout << "Enter number of rows:";cin >> n;int i,j,k;for (i = 1; i <= n; i++){for (j = 1; j <= n - i; j++){cout << ".";}for (k = 1; k <= i; k++){cout << "*";}cout << endl;}cin.get();cin.get();cin.get();return 0;}

希望大家指正。

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