Three methods for passing Parameters

1. Pass by value

Void swap (int A, int B) {int temp = A; A = B; B = temp;} int main () {int A = 2, B = 3; swap (a, B); Return 0 ;}

Advantage: easy to read

Disadvantage: the value in the main function cannot be changed.

 

2. Pass by pointer

Void swap (int * a, int * B) {int temp = * A; * A = * B; * B = temp;} int main () {int A = 2, B = 3; swap (& A, & B); Return 0 ;}

Advantage: the value of the main function can be changed, and parameters do not need to be copied in large quantities.

Disadvantages: Hard to read and error-prone

 

3. Pass by alias

Void swap (Int & A, Int & B) {int temp = A; A = B; B = temp;} int main () {int A = 2, B = 3; swap (a, B); Return 0 ;}

Advantage: it can change the value of the main function, which is easy to read and does not need to be copied in large quantities when passing parameters.