C++ Program to check whether a number is positive or negative
Check if a Number is Positive or Negative in C++
Given an integer input, The objective is to write a code to Check if a Number is Positive or Negative in C++ Language.
Output :The number is Positive
Check if a Number is Positive or Negative in C++
The objective of the C++ code is to check whether a given integer input is Positive or Negative. To do so we have the following Methods,
- Method 1: Using Brute Force
- Method 2: Using Nested if-else Statements
- Method 3: Using Ternary Operators
The Above methods are discussed in depth in the sections below.
Method 1: Using Brute Force
This method uses Brute Force to check whether a given integer is Positive or Negative.
C++ Code
#include <iostream>
using namespace std;
int main()
{
int num = 96;
//Conditions to check if the number is negative or positive
if (num > 0)
cout << "The number is positive";
else if (num < 0)
cout << "The number is negative";
else
cout << "Zero";
return 0;
}
Output
Enter a number: 96 The number is Positive
Algorithm
This method uses Brute Force to check whether a given integer is Positive or Negative. The Algorithm for the above code is as follows
- Step 1. Start
- Step 2. Insert the number.
- Step 3. If the number is greater than Zero then print “The number is Positive”
- Step4: If the number is smaller than zero, then print, “The number is Negative”
- Step 5. Else print, “The number is Zero”
- Step 6. Stop
Method 2: Using Nested if-else Statements
This method uses a nested if-else Statements to check whether a given number is Positive or Negative.
C++ Code
#include<iostream>
using namespace std;
int main()
{
int num = -12;
//Condition to check if the number is negative or positive
if (num >= 0)
{
if (num == 0)
cout << "Zero";
else
cout << "The number is positive";
}
else
cout << "The number is negative";
return 0;
}
Output
Enter a number: -12 The number is Negative
Algorithm
This method uses a nested if-else Statements to check whether a given number is Positive or Negative.
- Step 1 – Start
- Step 2 – Insert the number.
- Step 3 – If the number is greater or equal move to the inner nested loop
- Step 3.1 – If the number is zero, print Zero
- Step 3.2 – Else print The Number is Positive
- Step4 – Else the number has to be negative, Print The number is Negative
- Step 6 – Stop
Method 3: Using Ternary Operator
This method uses a ternary operator to check whether a number is Positive or Negative.
C++ Code
#include <iostream>
using namespace std;
int main()
{
int num = -15;
//Condition to check if the 0, positive or negative
if(num == 0)
cout << "Zero"; else (num > 0) ? cout << "Positive": cout << "Negative";
return 0;
}
Output
Enter a number: -15 Negative
Algorithm
- Step 1 – Start
- Step 2 – Insert the number.
- Step 3 – If number is equal to zero, Print Number is Zero
- Step 4 – Else do following – (num > 0) ? cout << “Positive”: cout << “Negative”;
- Step 6 – Stop
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