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3.1#include<iostream>using std::cout;using std::endl;int main(){ int sum = 0; int i = 50; while (i <= 100) { sum += i; i++; } cout << "50到100之间整数之和为" << sum <

12.2#ifndef MY_STRBLOB_H#define MY_STRBLOB_H#include<vector>#include<string>#include<initializer_list>#include<memory>#include<stdexcept>using namespace std;class StrBlob{public: typedef ve

10.1#include<iostream>#include<fstream>#include<vector>#include<algorithm>using namespace std;int main(int argc,char *argv[]){ ifstream in(argv[1]); if (!in) { cout << "打开输入文件失败

11.3#include<iostream>#include<fstream>#include<map>#include<string>#include<algorithm>using namespace std;int main(int argc, char *argv[]){ ifstream in(argv[1]); if (!in) { co

9.4#include<iostream>#include<vector>using namespace std;bool search_vec(vector<int>::iterator beg, vector<int>::iterator end, int val){ for (; beg != end; beg++) if (*beg == val)

7.1#include<iostream>#include"Sales_data.h"using namespace std;int main(){ cout << "请输入交易记录(ISBN，销售量，原价，实际售价):" << endl; Sales_data total; if (cin >> total) { Sales_data tran

2.1 wchar_t 16位 char16_t 16位 char32_t 32位 long double 扩展精度浮点数 10位有效数字在算数表达式中不要使用char和bool,只有在存放字符或者布尔值的地方使用它们，因为类型 char在一些机器上是有符号的，而在另一些机器上又是无符号的。如果一定使用char类型请指明是unsigned char 还是signed char执

2.5 处理类型 2.5.1 类型别名 传统法： 关键字：typedef例如：typedef double wages;//wages现在是double同义词重点！ typedef wages base,*p//现在base是double的同义词没有问题，注意！p是double * 的同义词C++后来引入了一种新的方法，别名声明来定义类型的别名。例如 using SI=Sales_item;

6.4#include<stdio.h>#include<vector>#include<ctime>#include<cstdio>#include<iostream>#include<string>using namespace std;int fact(int val){ if (val < 0) return -1; int ret = 1;

5.5#include<stdio.h>#include<vector>#include<ctime>#include<cstdio>#include<iostream>#include<string>using namespace std;int main(){ int grade; cout << "请输入您的成绩 "; cin >> grade; i

4.2#include<stdio.h>#include<vector>#include<ctime>#include<cstdio>#include<iostream>using namespace std;int main(){ vector<int> vec; srand((unsigned)time(NULL)); cout << "系统自动向向量生成一组

12.2#ifndef MY_STRBLOB_H#define MY_STRBLOB_H#include<vector>#include<string>#include<initializer_list>#include<memory>#include<stdexcept>using namespace std;class StrBlob{public: typedef ve