C Programs

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Decision Making Programs in C

Check whether a number is Positive, Negative, or Zero

Introduction

In mathematics:

• A positive number is greater than 0.
• A negative number is less than 0.
• Zero is neither positive nor negative.

This program reads a number from the user and determines whether it is positive, negative, or zero using an if-else decision-making structure.

C Program: Check whether a number is Positive, Negative, or Zero

#include <stdio.h>
 
int main() {
    int num;
 
    // Input from user
    printf("Enter a number: ");
    scanf("%d", &num);
 
    // Check conditions
    if (num > 0) {
        printf("%d is Positive.\n", num);
    }
    else if (num < 0) {
        printf("%d is Negative.\n", num);
    }
    else {
        printf("The number is Zero.\n");
    }
 
    return 0;
}
 

 
OUTPUT 1 :
Enter a number: 25
25 is Positive.

OUTPUT 2 :
Enter a number: -10
-10 is Negative.

OUTPUT 3 :
Enter a number: 0
The number is Zero.
 

Explanation

1. User enters an integer.
2. Program checks:
   • If num > 0 → positive
   • Else if num < 0 → negative
   • Else → zero
3. Prints the result accordingly.