Q. Write An Algorithm And Program to Check Whether a Number is Positive or Negative?

Here you will find an Algorithm And Program to Check Whether a Number is Positive or Negative. Given a numbers and our task is to find Whether a Number is Positive or Negative.

Positive Number : A number is said to be positive if the number is greater than 0 (zero). For Example : 1 to infinity.

Negative Number : A number is said to be negative if the number is less than 0 (zero). For Example : -1 to negative infinity.

Now let us understand what logic we need to use in this -
Given a number num1, we will check these conditions :
1. If the number num1 greater than 0 then output will be "You entered a positive number".
2. If the number num1 less than 0 then output will be "You entered a negative number".
3. If the above both condition is false then output will be "You entered 0".

For Example :-

Input : Enter the number num1: 5
Output : You entered a positive number

Explanation : As we can see that the number given in input, which is 5 which is greater than 0 therefore 5 is positive number.

Algorithm To Check Whether a Number is Positive or Negative

\\Algorithm To Check Whether a Number is Positive or Negative
START
Step 1: [ Take Input ] Read: Number Num
Step 2: If Num > 0
If true, print You entered a positive number.
Else If Num < 0
If true, print You entered a negative number.
Else 
print You entered 0.
END


Program to Check Whether a Number is Positive or Negative

  • C
  • C++
  • Java
  • Python
  • C#
  • PHP
    • //C Program to Check Whether a Number is Positive or Negative
#include <stdio.h> 
int main() 
{ 
int num1; 
//Enter the value for num1
printf("Enter the number num1: "); 
scanf("%d", &num1); 
if (num1 > 0) 
printf("You entered a positive number"); 
else if (num1 < 0) 
printf("You entered a negative number"); 
else
printf("You entered 0"); 
return 0; 
} 

    //C++ Program to Check Whether a Number is Positive or Negative
#include <iostream>
using namespace std;
int main()
{
int num1;
//Enter the value for num1
cout<<"Enter the number num1: ";
cin>>num1;
if (num1 > 0) 
cout<<"You entered a positive number"; 
else if (num1 < 0) 
cout<<"You entered a negative number"; 
else
cout<<"You entered 0"; 
return 0;
}

    //Java Program to Check Whether a Number is Positive or Negative
import java.util.Scanner;
public class LFC
{
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
//Enter the value for num
System.out.print("Enter the number num1: ");
int num = reader.nextInt();
if (num > 0) 
System.out.println("You entered a positive number");
else if (num < 0) 
System.out.println("You entered a negative number");
else
System.out.println("You entered 0");
}
}

    #Python Program to Check Whether a Number is Positive or Negative
#Enter the value for num
num = int(input("Enter the number num1: "))
if num > 0:
print("You entered a positive number")
elif num < 0:
print("You entered a negative number")
else:
print("You entered 0")

    //C# Program to Check Whether a Number is Positive or Negative
using System;
class LFC {
static void Main() {
string val;
int num;
Console.WriteLine("Enter the number num1: ");
val = Console.ReadLine();
// convert to integer
//Enter the value for num
num = Convert.ToInt32(val);
if (num > 0) 
Console.WriteLine("You entered a positive number");
else if (num < 0) 
Console.WriteLine("You entered a negative number");
else
Console.WriteLine("You entered 0");
}
}

    //PHP Program To Find the Largest Number Among Three Numbers
//Enter the value for num
$num = (int)readline('Enter the number num1: '); 
if ($num > 0)
echo "You entered a positive number";
else if ($num < 0) 
echo "You entered a negative number";
else
echo "You entered 0";

    //C Program to Check Whether a Number is Positive or Negative
#include <stdio.h> 
int main() 
{ 
int num1; 
//Enter the value for num1
printf("Enter the number num1: "); 
scanf("%d", &num1); 
if (num1 > 0) 
printf("You entered a positive number"); 
else if (num1 < 0) 
printf("You entered a negative number"); 
else
printf("You entered 0"); 
return 0; 
}

    Output

    Enter the number num1: 2
You entered a positive number

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