C++ Exercises: Check whether a number is positive, negative or zero

Last update on August 11 2025 12:58:24 (UTC/GMT +8 hours)

Check Number Sign (Positive, Negative, Zero)

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

Visual Presentation:

C++ Exercises: Check whether a number is positive, negative or zero

Sample Solution:

C++ Code :

#include <iostream> // Including input-output stream header file

using namespace std; // Using the standard namespace

int main() // Start of the main function
{
    signed long num1 = 0; // Declaring and initializing a signed long variable num1 to zero

    cout << "\n\n Check whether a number is positive, negative or zero :\n"; // Outputting a message indicating the purpose of the program
    cout << "-----------------------------------------------------------\n"; // Outputting a separator line

    cout << " Input a number : "; // Prompting the user to input a number
    cin >> num1; // Taking input for the variable num1 from the user

    if (num1 > 0) // Checking if the entered number is greater than zero
    {
        cout << " The entered number is positive.\n\n"; // Outputting a message if the number is positive
    }
    else if (num1 < 0) // Checking if the entered number is less than zero
    {
        cout << " The entered number is negative.\n\n"; // Outputting a message if the number is negative
    }
    else // Handling the case where the entered number is zero
    {
        std::cout << " The number is zero.\n\n"; // Outputting a message if the number is zero
    }

    return 0; // Returning 0 to indicate successful program execution
} // End of the main function

Sample Output:

 Check whether a number is positive, negative or zero :                
-----------------------------------------------------------            
 Input a number : 8                                                    
 The entered number is positive.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to determine if a number is positive, negative, or zero and then print a customized message for each case.
Write a C++ program that reads an integer and prints whether it is positive, negative, or zero using a ternary operator.
Write a C++ program to check the sign of a number and then display an appropriate ASCII art smiley for positive, frowny for negative, and neutral for zero.
Write a C++ program that uses a switch statement to classify a number as positive, negative, or zero after comparing it to zero.

Go to:

PREV : Rectangular Pattern of Single Digit.
NEXT : Divide Two Numbers and Print Quotient.

C++ Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.