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C Program to Check Whether a Number is Positive or Negative

In this example, you will learn to check whether a number (entered by the user) is negative or positive.

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To understand this example, you should have the knowledge of the following C programming topics:


This program takes a number from the user and checks whether that number is either positive or negative or zero.


Check Positive or Negative Using if…else

#include int main() { double num; printf("Enter a number: "); scanf("%lf", &num); if (num <= 0.0) { if (num == 0.0) printf("You entered 0."); else printf("You entered a negative number."); } else printf("You entered a positive number."); return 0; }

You can also solve this problem using nested if else statement.


Check Positive or Negative Using Nested if…else

#include int main() { double num; printf("Enter a number: "); scanf("%lf", &num); if (num < 0.0) printf("You entered a negative number."); else if (num > 0.0) printf("You entered a positive number."); else printf("You entered 0."); return 0; }

Output 1

Enter a number: 12.3
You entered a positive number.

Output 2

Enter a number: 0
You entered 0.
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