Passing an Array to a Function (ICT Programming)

1. Passing An Array To a Function

2. When passing an array to a function, we need to tell the compiler what the type of the array is and give it a variable name, similar to an array declaration float a[] parameter We need to specify the name of the array without any brackets int myArray [24]; myFunction (myArray,24); -Arrays passed call-by-reference -Name of array is address of first element -Function knows where the array is stored(Modifies original memory locations)

3. Arrays are always Passed by Reference Arrays are automatically passed by reference. Do not use & . If the function modifies the array, it is also modified in the calling environment void Zero( int arr [], int N) { for ( int k=0; k<N; k++) arr [k ]=0 ; Function prototype: void modifyArray ( int b[], int arraySize ); -Parameter names optional in prototype int b[] could be written int [] int arraySize could be simply int

4. /*Example Number 1*/ #include < iostream.h > int Display( int int data [] , int N ) { int k ; cout <<“Array contains”<< endl ; for ( k =0; k <N; k ++) cout <<data[ k ]<<“ “; cout << endl ; } int main() { int a[4] = { 11, 33, 55, 77 }; Display( a , 4); } An int array parameter of unknown size Size of the array The array argument

5. /*Example Number 2 */ #include < iostream.h > int sum( int data[], int n); void main() { int a[] = { 11, 33, 55, 77 }; int size = sizeof (a)/ sizeof ( int ); cout << "sum( a,size ) = " << sum( a ,size ) << endl ; } int sum( int data [] , int n ) { int sum=0; for ( int i =0; i < n;i ++) sum += data[ i ]; return sum; } The array argument An int parameter of unkown size Size of the array