Record about the automatic initialization of C++ integer array to zero

Automatically initialize to zero

Given an element value during declaration, other elements in the array are initialized to zero at this time.

int a[5] = {
    
    0};

Take a look at the results:

Manually initialize the array to zero

method one

int a[5];
for(int i=0;i<sizeof(a)/4;i++)
	a[i] = 0;

Way two

First introduce the header file cstring

int a[5];
memset(a,0,sizeof(a));  

Note that the memset function here, because it initializes the memory block by bytes, it cannot initialize the integer array to a number other than 0 or -1, and the third parameter should be the integer array size multiplied by the number of bytes occupied by the integer 4 .

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