c++ primer 4.11.1节练习答案

练习6.40 a)正确 b)错误,一旦某个形参被赋予了默认值,他后面的所有形参都必须有默认值. 练习6.41 a)错误,ht没有默认实参,而a的实参列表里也没有给出实参: b)合法,调用init(24 ,10 ,' '): c)虽然合法,但是与程序猿的设计初衷不符,*会转换成十进制的数43,相当于调用init(14, 43, ' '): 练习6.42 1 string make_plural(size_t ctr, const string &word, const string &end

练习5.20 1 int main() 2 { 3 vector<string> str; 4 string str1; 5 while (cin >> str1) 6 { 7 auto last = str.end(); 8 if (str.size() != 0 && str1 == (*(last-1))) 9 { 10 cout << str1 << endl; 11 break; 12 } 13 else 14 str.push_b

练习5.22 1 int main() 2 { 3 int sz = get_size(); 4 while (sz <= 0) 5 { 6 sz = get_size(); 7 continue; 8 } 9 system("pause"); 10 return 0; 11 }

练习5.21 1 #include <iostream> 2 #include <string> 3 #include <cstring> 4 #include <vector> 5 using namespace std; 6 int main() 7 { 8 vector<string> str; 9 string str1; 10 while (cin >> str1) 11 { 12 auto last = str.end()

练习5.18 a)循环体少了花括号: b)不允许在条件部分定义变量: c)condition使用的变量必须定义在循环体之外: 练习5.19 1 int main() 2 { 3 string str1, str2; 4 int i; 5 do 6 { 7 cout << "please enter two string:"; 8 if (cin >> str1 >> str2) 9 { 10 if (str1.size() < str2.siz

练习6.21 1 int max(const int x, const int *y) 2 { 3 if (x > *y) 4 return x; 5 else 6 return *y; 7 } 8 9 int main() 10 { 11 int a1, a2; 12 while (cin >> a1 >> a2) 13 { 14 cout << "the max is " << max(a1, &a2) <<

练习6.16 1 bool is_empty(const string &s) { return s.empty(); } 练习6.17 1 bool have_upper(const string &s) 2 { 3 for (auto c : s) 4 { 5 if (isupper(c)) 6 return true; 7 } 8 return false; 9 } 10 11 void to_lower(string &s) 12 { 13 for (auto &c

练习5.14 1 int main() 2 { 3 vector<string> str; 4 string str1,str2; 5 int max = 0; 6 while (cin >> str1) 7 { 8 int cnt = 0; 9 str.push_back(str1); 10 auto it = str.begin(); 11 while (it != str.end()) 12 { 13 if (*it == str1) 14 ++cnt; 15 ++it; 1

练习5.9 1 int main() 2 { 3 vector<string> str; 4 string str1; 5 int cnt = 0; 6 while (cin >> str1) 7 str.push_back(str1); 8 for (auto &c : str) 9 for(auto d : c) 10 { 11 if (d == 'a' || d == 'e' || d == 'i' || d == 'o' || d == 'u') 12 cnt++;