第六章—函数

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//exercise 6.17#include <iostream>#include <string>using namespace std;bool exist_upper(const string &s){for(auto id : s){if(isupper(id))return true;}return false;}void string_tolower(string &s){if(exist_upper(s)){for(auto &c : s)c = tolower(c);}}int main() {// your code goes herestring s = "Hello World";cout << exist_upper(s) << endl;string_tolower(s);cout << s <<endl;return 0;}

//exercise 6.27#include <iostream>using namespace std;int sum(initializer_list<int> val){int result = 0;for(auto p = val.begin(); p != val.end(); ++p)result += *p;return result;}int main() {// your code goes herecout << sum({1, 2, 3, 4, 5});//一定不能忘记大括号！return 0;}

//exercise 6.55#include <iostream>#include <vector>using namespace std;int func_add(int a, int b){return a + b;}int func_sub(int a, int b){return a - b;}int func_div(int a, int b){return a / b;}int func_mul(int a, int b){return a * b;}using pf = int (*)(int, int);vector<pf> v{func_add, func_sub, func_div, func_mul};int main() {for (auto it = v.cbegin(); it != v.cend(); ++it)        cout << (*it)(2, 2) << std::endl;return 0;}

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