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Zero Initialization in C++
Zero initialization is setting the initial value of an object in c++ to zero.
Syntax
T{} ; char array [n] = “”;
The situations in which zero initialization are performed are −
Named variable with static or thread-local storage is initialized to zero.
It is used as initialization of values for non-class types and members of a class that do not have a constructor.
It is used to initialize a character array when its length is greater than the number of characters that are to be assigned.
Points to remember
Some types of variables like static variables and thread-local variables are first initialized to zero then reinitialized to a value when called.
A zero-initialized pointer is called a null pointer.
Example
Program to show the implementation of zero initialization in C++ −
#include <iostream> #include <string> using namespace std; struct zeroInitialization { int x, y, z; }; float f[3]; int* p; string s; int main(int argc, char* argv[]){ zeroInitialization obj = zeroInitialization(); cout<<"Zero initialized object variable :\t"; cout<<obj.x<<"\t"<<obj.y<<"\t"<<obj.z<<"\n"; cout<<"Zero initialized float value :\t"; cout<<f[0]<<"\t"<<f[1]<<"\t"<<f[2]<<"\n"; cout<<"Zero initialized pointer value :\t"; cout<<p<<"\n"; return 0; }
Output
Zero initialized object variable : 0 0 0 Zero initialized float value : 0 0 0 Zero initialized pointer value : 0
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