1. Design a swap module that accepts two arguments of the Real data type and swa

Question

1. Design a swap module that accepts two arguments of the Real data type and swaps them.

2. Validate understanding This was previous answer

PROGRAM: Swap_module
Input: two numbers

Step 1. INPUT number in variable argument[1]
Step 2. INPUT number in variable argument[2]
Step 3. Callswap(arugment[1],argument[2])
Step 4. Exit Program

This is my Code: is this correct

// the swap module accepts two integer arguments and swap the values.

Module swap (Integer Ref a, Integer Ref b)

Declare Integer a;

Declare Integer b;

Declare Integer temp;

Set temp = a;

Set a = b;

Set b = temp;

End Module

Explanation / Answer

Your pseduo code seems correct to me but it uses extra memory to swap i.e it uses extra temp variable to swap which is not necessary. You can swap two variables without actually using extra memory in form of temp variable.

Module swap (Integer Ref a, Integer Ref b)

Declare Integer a;

Declare Integer b;

Declare Integer temp;

Set a = a + b;

Set b = a - b;

Set a = a - b;

End Module

Above pseudo code uses addition to swap two variables but you can also use xor operation or multiplication. You can view java code for the same here(http://opensourceforgeeks.blogspot.in/2013/12/swapping-two-numbers-without-using.html).

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