Profit Calculator with Validation

2024/Feb/Mar·Variant 2

MEDIUMLoops

Continuously read pairs of cost price and selling price, calculate the profit (sell − cost), and output it. Repeat until both values are 0.

Both inputs must be validated to ensure they are 0 or greater (negative values are rejected). The pair 0, 0 stops the algorithm without producing output.

Input: Alternating cost and sell prices. Output: "Profit is X" for each valid non-exit pair.

Example:

Input:  -5
        10
        15
        0
        0
Output: Profit is 5

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Sample Test Cases

Test 1: Simple valid case

Inputs: 10, 15, 0, 0

Expected: Profit is 5

Test 2: Negative cost validation

Inputs: -5, 10, 12, 0, 0

Expected: Profit is 2

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