Several initialization methods of integer in C++11

Several initialization methods of integer in C++11

0X00 Foreword

We all know that in C++, the most common integer initialization method is = assignment. But in fact, C++11 provides several ways.
There are more ways and more ways out. This is also for the convenience of developers. Don't say much, just start talking.

0X10 initialize with'='

This is the most common and commonly used method, and it is also an initialization method that fits daily habits. as follows:

int x=1;

Here, use'=' to assign x to 1.

0X11 Initialize with'()'

It is not so common to use (), and the value in parentheses is the initialized value. as follows:

int y(2);

The value of y is initialized to 2. The parentheses look simple and concise. And it looks a bit like a function, otherwise, if you get used to it, the overall code will look much more beautiful

0X12 Initialize with'{}'

Compared with the previous two, using'{}' is obviously not so beautiful and concise. as follows:

int z={
    
    3};

Or remove the'=' and use'{}' directly

int z{
    
    3};

Since it seems so complicated, why use it? In fact, we can think about whether this method is similar to the initialization of integer data, yes

int arry[2]={
    
    1,2};

So such assignments are corroborated, and won’t appear so abrupt.

0X20 test

#include<iostream>
using namespace std;
int main()
{
    
    
	int x=1;
	int y(2);
	int z{
    
    3};
	cout<<"用=初始化x为："<<x<<endl;
	cout<<"用()初始化y为："<<y<<endl;
	cout<<"用{}初始化z为："<<z<<endl;
	return 0;
}

Test Results: