Part 1 Landscape Hannu Laine

Pointer parameters //prototype of swap void swap(int *a, int *b); //application void main(void) { in number1 = 1, number2 = 2; swap(&number1, &number2); printf("%d %d", number1, number2); } //implementation of swap void swap(int *a, int *b) { int aux; aux = *a; *a = *b; *b = aux; } Reference parameters Comparing pointer parameters and reference parameters Back //prototype of swap void swap(int &a, int &b); //application void main(void) { in number1 = 1, number2 = 2; swap(number1, number2); //pointers are // passed instead of values printf("%d %d", number1, number2); } //implementation of swap void swap(int &a, int &b) { int aux; aux = a;//deferencing is used internally a = b;//with a and b b = aux; }

Returning a pointer //prototype of a function int *getMax(int *arr, int n); //application int main(void) { int maxValue; int array[6] = {3, 5, 2, 8, 6, 7}; printf (”%d”, *getMax(array, 6)); //Right value maxValue = *getMax(array, 6); *getMax (array, 6) = *getMax (array, 6) *10; //Left value } //implementation getMax int *getMax(int *arr, int n) { int i, maxi = 0; for (i = 1 ; i < n ; i++) if (arr [ i ] > arr [ maxi ] ) maxi = i; return &arr[maxi]; } Returning a reference Returning a pointer and returning a reference Back //prototype of a function int &getMax(int *arr, int n); //application int main(void) { int maxValue; int array[6] = {3, 5, 2, 8, 6, 7}; printf (”%d”, getMax(array, 6)); //Right value maxValue = getMax(array, 6); getMax(array, 6) = getMax(array, 6) *10; //Left value } //implementation getMax int &getMax(int *arr, int n) { int i, maxi = 0; for (i = 1 ; i < n ; i++) if (arr [ i ] > arr [ maxi ] ) maxi = i; return arr[maxi]; }