• On February 11, 2025
• By Karmehavannan
• 0 Comment
• Categories: Check value
• Tags: C examples, C language

C program to check whether a number is Positive or Negative or Zero

C program to check whether a number is Positive or Negative or Zero

In this tutorial, we will discuss a concept in C program to check whether a number is Positive or Negative or Zero

In this post, we will learn how to check if the number is positive or negative or zero in C programming language

 

Logic of the program

If a number is greater than zero it is a positive number(if the number>0)

If a number is less than to zero it is  Negative number (if the number<0)

if the number is equal to zero the number is zero(if the number==0)

 

C program to check whether a number is Positive or Negative or Zero

Using if else if statements

Program 1

This program allows the user to enter a number and check if the number(entered by user) is positive or negative or zero using if-else if statements

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num1;
    printf("Enter a number: ");
    scanf("%d",&num1);//get input from user for check
    if(num1>0){
            printf("%d",num1);
    printf(" is a positive number");
}
else if(num1<0){
        printf("%d",num1);
    printf(" is a Negative number");
}
else{
    printf("You entered zero");
}
getch();
    return 0;

}

When the above code is executed, it produces the following results

case 1

Enter a number: 35
35 is a positive number

case 2

Enter a number: -10
-10 is a Negative number

case 3

Enter a number: 0
you entered zero

 

 

Using Nested  if statements

Program 2

This program allows the user to enter a number and check if the number is positive or negative or zero using Nested if statements

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num1;
    printf("Enter a number: ");
    scanf("%d",&num1);//get input from user for check

    if(num1<=0){

    if(num1==0){
    printf("you entered zero");
}
else{
    printf("%d",num1);
    printf(" is a negative number");
}
}
else{
    printf("%d",num1);
    printf(" is a positive number");

}
getch();
    return 0;
}

 

When the above code is executed, it produces the following results

 

case 1

Enter a number: 10
10 is a positive number

case 2

Enter a number: -6
-6 is a negative number

case 3

Enter a number: 0
you entered zero

 

 

 

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