Step 1. Call by Values - Swap Function 1. Declare a function named swap on the top of your main to accept two int variables and returns void. 2. Write your main function as follow: int main() ( int x = 2; int y = 14; printf("Before swap method: x=%d, y=%d.\n", x,y); swap(x,y); printf("After swap method: x=%d, y=%d.\n", x,y); return 0; } 3. Develop swap function to swap two variables. void swap (int a, int b) ( //write a code to swap a and b. printf("In swap function a=%d, b=%d.\n", a,b); return; Output sample: Before swap method: x=14, y=2. In swap function a=14, b=2. After swap method: x=2, y=14. Step 2. Call by Reference. As you saw in step 1, to effectively exchange the values of two variables we can't use a function as call by values. 1. Change the function declaration at the top of the main functon to accept two pointers to int. 2. Change the swap function header to accept two pointers to int as a parameter list. 3. Change the swap function's body to work on two pointers to exchange the values of two variables.

Step 1. Call by Values - Swap Function 1. Declare a function named swap on the top of your main to accept two int variables and returns void. 2. Write your main function as follow: int main() ( int x = 2; int y = 14; printf("Before swap method: x=%d, y=%d.\n", x,y); swap(x,y); printf("After swap method: x=%d, y=%d.\n", x,y); return 0; } 3. Develop swap function to swap two variables. void swap (int a, int b) ( //write a code to swap a and b. printf("In swap function a=%d, b=%d.\n", a,b); return; Output sample: Before swap method: x=14, y=2. In swap function a=14, b=2. After swap method: x=2, y=14. Step 2. Call by Reference. As you saw in step 1, to effectively exchange the values of two variables we can't use a function as call by values. 1. Change the function declaration at the top of the main functon to accept two pointers to int. 2. Change the swap function header to accept two pointers to int as a parameter list. 3. Change the swap function's body to work on two pointers to exchange the values of two variables.

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter10: Pointers

Section: Chapter Questions

Problem 2PP

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