C++ examples for Function:Function Parameter
Passing arrays and individual array elements to functions.
#include <iostream> #include <iomanip> using namespace std; void modifyArray( int [], int ); // appears strange; array and size void modifyElement( int ); // receive array element value int main() // ww w .j a v a 2s .c o m { const int arraySize = 5; // size of array a int a[ arraySize ] = { 0, 1, 2, 3, 4 }; // initialize array a cout << "\nThe values of the original array are:\n"; // output original array elements for ( int i = 0; i < arraySize; ++i ) cout << setw( 3 ) << a[ i ]; cout << endl; // pass array a to modifyArray by reference modifyArray( a, arraySize ); cout << "The values of the modified array are:\n"; for ( int j = 0; j < arraySize; ++j ) cout << setw( 3 ) << a[ j ]; cout << "\n\nEffects of passing array element by value:" << "\na[3] before modifyElement: " << a[ 3 ] << endl; modifyElement( a[ 3 ] ); // pass array element a[ 3 ] by value cout << "a[3] after modifyElement: " << a[ 3 ] << endl; } //"b" points to the original array "a" in memory void modifyArray( int b[], int sizeOfArray ) { // multiply each array element by 2 for ( int k = 0; k < sizeOfArray ; ++k ) b[ k ] *= 2; } // "e" is a local copy of array element a[ 3 ] passed from main void modifyElement( int e ) { // multiply parameter by 2 cout << "Value of element in modifyElement: " << ( e *= 2 ) << endl; }