C program to Check Whether a Number is Positive or Negative or Zero

Given a number A. The task is to check whether A is positive, negative or zero. Examples:

Input: A = 2
Output: 2 is positive

Input: A = -554
Output: -554 is negative

In the below program, to find whether A is positive, negative or zero; first the number is taken as input from the user using scanf in , and then A is checked for positive using statement and , and operators. Below is the C program to find whether a number is positive, negative or zero. 

C

#include <stdio.h>

int main()
{
    int A;

    printf("Enter the number A: ");
    scanf("%d", &A);

    if (A > 0)
        printf("%d is positive.", A);
    else if (A < 0)
        printf("%d is negative.", A);
    else if (A == 0)
        printf("%d is zero.", A);

    return 0;
}

Output:

Enter the number A =: -54
-54 is negative.

Time Complexity: O(1)

Auxiliary Space: O(1)