Static arrays are initialized to zero. - C++ Data Type

C++ examples for Data Type:Array

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Description

Static arrays are initialized to zero.

Demo Code

#include <iostream> 
using namespace std; 

void staticArrayInit( void ); // function prototype 
void automaticArrayInit( void ); // function prototype 
const int arraySize = 3; 

int main() /*from w  ww  .ja v  a2s . c om*/
{ 
    cout << "First call to each function:\n"; 
    staticArrayInit(); 
    automaticArrayInit(); 

    cout << "\n\nSecond call to each function:\n"; 
    staticArrayInit(); 
    automaticArrayInit(); 
    cout << endl; 
}

void staticArrayInit( void ) 
{ 
    // initializes elements to 0 first time function is called 
    static int array1[ arraySize ]; // static local array 

   cout << "\nValues on entering staticArrayInit :\n"; 

   for ( int i = 0; i < arraySize; ++i ) 
       cout << "array1[" << i << "] = " << array1[ i ] << "\n"; 

   cout << "\nValues on exiting staticArrayInit:\n" ; 

   // modify and output contents of array1 
   for ( int j = 0; j < arraySize; ++j ) 
       cout << "array1[" << j << "] = " << ( array1[ j ] += 5 ) << "  "; 
}

// function to demonstrate an automatic local array 
void automaticArrayInit( void ) { 
   // initializes elements each time function is called 
   int array2[ arraySize ] = { 1, 2, 3 }; // automatic local array 

   cout << "\n\nValues on entering automaticArrayInit:\n"; 

   // output contents of array2 
   for ( int i = 0; i < arraySize; ++i ) 
       cout << "array2[" << i << "] = " << array2[ i ] << "  "; 

   cout << "\nValues on exiting automaticArrayInit:\n"; 

   // modify and output contents of array2 
   for ( int j = 0; j < arraySize; ++j ) 
       cout << "array2[" << j << "] = " << ( array2[ j ] += 5 ) << "  "; 
}

Result


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