QBASIC – Check if a number is positive, negative, or zero

Table of Contents

• Overview
• Output
• Explanation
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Overview

Below is the program to check whether a user input number is positive, negative, or zero.

REM Program to check if a number is positive, negative or zero
INPUT "Enter a number: "; n
IF n > 0 THEN
  PRINT n;" is positive number"
ELSE IF n < 0 THEN
  PRINT n;" is negative number"  
ELSE 
  PRINT n;" is zero"
END IF
END

Output

Explanation

Let’s first understand positive, negative, and zero numbers. Positive numbers are the ones that are greater than 0 while negative numbers are the ones that are lower than 0 and obviously 0 is a zero. So, we will check if the number is greater than 0 using greater than symbol (>) then the number is positive. Also, we will check if the number is lower than 0 using a lower than symbol (<).

Note these symbols >, < are known as comparison operators.

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