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Program to find absolute value of a given number

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

Last Updated : 16 Aug, 2024

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

Examples

Input: 10
Output: Positive
Explanation: Since 10 is greater than 0, it is positive.

Input: -5
Output: Negative
Explanation: Since -5 is less than 0, it is negative.

Different Ways to Check for Positive Numbers, Negative Numbers, or Zero in C

There are two ways to check whether a given number is positive, negative, or zero:

Table of Content

Using Conditional Statements Like if-else
Using Bit Operators

1. Using Conditional Statements Like if-else

The idea is to use simple if-else-if ladder to check for the equality manually. First use if statement for zero, then else if statement of less than zero numbers (negative) and finally if nothing matches, then it is positive numbers.

Implementation

C

// C Program to check if a number is positive, negative, // or zero using simple conditional checks #include <stdio.h>  void checkNum(int N) {        // Check if the number is zero     if (N == 0) {         printf("Zeri\n");     }     // Check if the number is less than zero     else if (N < 0) {         printf("Negative\n");     }     // If neither, the number is positive     else {         printf("Positive\n");     } }  int main() {     int N = 10;     checkNum(N);     return 0; }

Output

Positive

Time Complexity: O(1)
Auxiliary Space: O(1)

2. Using Bit Operators

The most significant bit (MSB) in the binary representation of an integer is the sign bit. For positive numbers, the sign bit is 0, and for negative numbers, the sign bit is 1. By extracting the MSB from the number, we can determine the sign of the given number. For zero, we have to check it in the same way as previous method.

Implementation

C

// C Program to check if a number is positive, negative, // or zero using bitwise operators #include <stdio.h>  void checkNum(int N) {      // Check if the number is zero     if (N == 0) {         printf("Zero\n");         return;     }      // Extracting msb     int msb = N & (1 << (sizeof(int) * 8 - 1));      if (msb)         printf("Negative\n");     else         printf("Positive\n"); }  int main() {     int N = 10;     checkNum(N);     return 0; }

Output

Positive

Time Complexity: O(1)
Auxiliary Space: O(1)

Bitwise Operators in C
C Program to Find the Largest of Three Numbers
C Program to Check for Prime Numbers

Program to find absolute value of a given number

R

RishabhPrabhu

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Article Tags :

C Language
C Programs
School Programming
C Basic Programs

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