Write pseudocode to solve the "swap" problem:?

Question

Write pseudocode to solve the "swap" problem: get the user to enter integer values into variables a and b, and then store the user's value for b in variable a and the user's value for a in variable b. For example, if the user entered 7 and 8, so that we had a=7 and b=8 initially, we want to finish with a=8 and b=7.

Answer 1

If you have a stack it is easy.

Get integer into register A
Get integer into register B
Push down register A onto stack
Pick up register B contents
Store it in register A
Pop off stack into Register B.

Answer 2

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Answer 3

int a,b,c;

get A
Get B

C=a;
a=b;
b=c;

Answer 4

int a,b ;

a = a + b;
b = a - b;
a = a - b;