#include <iostream> #include <string> #include <vector> using namespace std; int main(){ vector<string> arr={"li ming","wang lei","han meimei"}; for(auto& n : arr) ///这里使用auto&的原因 { n = "DDD"; } return 0; } 自定义对象也支持Range-based循环语法 //返回第一个迭代子...
namespace std; // forward-declaration to allow use in Iter class IntVector; class Iter { public: Iter (const IntVector* p_vec, int pos) : _pos( pos ) , _p_vec( p_vec ) { } // these three methods form the basis of an iterator for use with // a range-based for loop bool...
P0306R4 Adding __VA_OPT__ for comma omission and comma deletion VS 2019 16.5. To provide better backward compatibility, __VA_OPT__ is enabled under /Zc:preprocessor across all language versions. P0614R1 Range-based for-loops with initializers VS 2019 16.5 20 P0683R1 Default mem...
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P0306R4 Adding __VA_OPT__ for comma omission and comma deletion VS 2019 16.5. To provide better backward compatibility, __VA_OPT__ is enabled under /Zc:preprocessor across all language versions. P0614R1 Range-based for-loops with initializers VS 2019 16.5 20 P0683R1 Default mem...
1、Range方法 Range方法用于生成一系列连续的整数，其声明如下：其中，start表示起始值，count表示生成的整数个数。下面是一个简单的例子，演示了如何使用Range方法生成一系列整数：try.dot.net实验结果：在上面的例子中，Enumerable.Range(2, 5)生成了从1开始，包含5个元素的整数序列。2、Repeat方法 Repeat方法用于...
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for i in range(2):print(i)得到结果是0 1 ，就是说输出两次。for i in range(2):a = 0 b = 0 print(str(a)+':'+str(b))while a==0 and b == 0:a += 1 遍历两次，a=0，b=0在循环内部，每次print前，a,b都会重新赋值为0，所以结果都是0：0。a = 0 b = 0 ...
for i in range（a,b,c）a为循环开始的数字(可不填，默认为0)，b为循环结束的后一位（c为正数时）的数字，c为步进的距离和方向，默认为1。for i in range(1, 101，1):print i range(1, 101)表示从1开始，到101为止（不包括101），取其中所有的整数。for i in range(1, 101)就是说...
for i in range(1, 101，1):print i range(1, 101)表示从1开始，到101为止（不包括101），取其中所有的整数。for i in range(1, 101)就是说，把这些数，依次赋值给变量i。相当于一个一个循环过去，第一次i = 1，第二次i = 2，……，直到i = 100。当i = 101时跳出循环。