Program to find the positive and negative number

By: Prof. Fazal Rehman Shamil						

Last modified on January 30th, 2021			

Program to find the positive and negative number

Logic:

The number is positive

if number > 0

For example: 4 > 0 so 4 is a positive number

The number is negative

if number < 0

For example: -4 < 0 so -4 is a negative number

Flowchart of a positive-negative number

SFT (Shamil’s Flow Table )

Are you interested to Read about SFT(Shamil’s Flow Table)?

#include<iostream>
using namespace std;
int main()
{
int number;
cout<<"Enter any number"<<endl;
cin>>number;
if(number<0)
{
cout<<"Number is negative"<<endl;
}
else
{
cout<<"Number is positive"<<endl;
}
}

#include<iostream>

using namespace std;

int main()

{

int number;

cout<<"Enter any number"<<endl;

cin>>number;

if(number<0)

{

cout<<"Number is negative"<<endl;

}

else

{

cout<<"Number is positive"<<endl;

}

Output:

c++ program to check whether a number is positive or negative

Program with Comments:

#include<iostream>
//Adding the header file iostream
using namespace std;
//Adding the namespace
int main()
//Starting of integer type main function
{
//Starting of main function
int number;
//eclaration of integer type variable named as number. Variable number can have any value.
cout<<"Enter any number"<<endl;
//Display message.
cin>>number;
//User input the integer value and value is stored in variable number.
if(number<0)
//Value in variable number is checked by if condition. If the value of a number is less than 0, then the number is negative and control moves to the statement 9.But if the value of a number is greater than 0, then the number is positive and control moves to the statement 12.
{
//start of if body
cout<<"Number is negative"<<endl;
//Display the message that number is negative.
}
//ending of if
else
Control arrives at statement 12 if the condition is false at statement 8. 
{
cout<<"Number is positive"<<endl;
//Display message that number is positive.
}
//Ending of else.
}
//Ending of main function.

#include<iostream>

//Adding the header file iostream

using namespace std;

//Adding the namespace

int main()

//Starting of integer type main function

{

//Starting of main function

int number;

//eclaration of integer type variable named as number. Variable number can have any value.

cout<<"Enter any number"<<endl;

//Display message.

cin>>number;

//User input the integer value and value is stored in variable number.

if(number<0)

//Value in variable number is checked by if condition. If the value of a number is less than 0, then the number is negative and control moves to the statement 9.But if the value of a number is greater than 0, then the number is positive and control moves to the statement 12.

{

//start of if body

cout<<"Number is negative"<<endl;

//Display the message that number is negative.

}

//ending of if

else

Control arrives at statement 12 if the condition is false at statement 8.

{

cout<<"Number is positive"<<endl;

//Display message that number is positive.

}

//Ending of else.

}

//Ending of main function.

Program to find the positive and negative number