C program to check whether a number is positive, negative or zero

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Write a C program to check positive, negative or zero. C program to input any number from user and check whether the given number is positive, negative or zero. How to check negative, positive or zero using if else in C program. Logic to check negative, positive or zero in C program.

Example

Input

Input number: 23

Output

23 is positive

Required knowledge

Basic programming, Basic mathematics, Use of relational operator, If else

Logic to check positive, negative or zero

Logic to this program is simple if you know basic maths. Let us first see some facts about numbers.

  • A number is said to be negative if it is less than 0 i.e. n < 0.
  • A number is said to be positive if it is greater than 0 i.e. n > 0.

Below is the step by step descriptive logic to check positive, negative or zero -

  1. Read a number from user in some variable say num.
  2. Check if num < 0. If it is then the number is negative. Hence print negative number.
  3. Check if num > 0. If it is then the number is positive. Hence print positive number.
  4. If the given number is neither positive nor negative. Then the number is zero. Hence print zero for this case.

Let us code the solution of this program.

Program to check positive, negative or zero

/**
 * C program to check positive negative or zero
 */

#include <stdio.h>

int main()
{
    int num;
    
    /* Read number from user */
    printf("Enter any number: ");
    scanf("%d", &num);
    

    if(num > 0)
    {
        printf("Number is POSITIVE");
    }
    else if(num < 0)
    {
        printf("Number is NEGATIVE");
    }
    else
    {
        printf("Number is ZERO");
    }

    return 0;
} 
Output
Enter any number: 10
Number is POSITIVE

Happy coding ;)

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1 comment:

  1. Basic C Program for Computer Programmer who want to learn. If you have simple wish you may visit. To get all update stay with us.
    Outline:
    • Language: C and Simscript.
    • if (Condition) statement and Nested if statement is used to determine the given number is positive, negative, even or odd. Another way we solve this program using if-else-if ladder.
    • When the given condition or expression is true the statement associated with it executed.
    To know details:
    http://www.secufoon.com/write-a-c-program-for-determining-a-number-is-positive-negative-even-or-odd/

    ReplyDelete