VARIABLE.CPP

//input the side of a square. You have to output the area of the square.

/*#include <iostream>
using namespace std;

int main(){
   int n;
   cout<<"enter side of a square:";
   cin>>n;
   cout<<"area of square is:"<<n*n;
    return 0;
} */



//Enter cost of 3 items from the user-a pencil,a pen and an eraser.You have to output the total cost of the items back to the user as their bill.

/*#include <iostream>
using namespace std;
int main(){
    float pencil,pen,eraser;
    int gst=18;
    cout<<"enter cost of pencil:";
    cin>>pencil;
    cout<<"enter cost of pen:";
    cin>>pen;
    cout<<"enter cost of eraser:";
    cin>>eraser;
    cout<<"total cost of items is:"<<pencil+pen+eraser<<endl;
    cout<<"total cost with GST is:"<<pencil+pen+eraser+(pencil+pen+eraser)*gst/100<<endl;
return 0;
}*/



//Build a Simple Interest Calculator.

/*#include <iostream>
using namespace std;
int main(){
    float p,r,t;
    cout<<"enter principal amount:";
    cin>>p;
    cout<<"enter rate of interest:";
    cin>>r;
    cout<<"enter time in years:";
    cin>>t;
    cout<<"simple interest is:"<<p*r*t/100<<endl;
    cout<<"total amount is:"<<p+p*r*t/100<<endl;
return 0;
}*/



//Write a program to convert temperature from Celsius to Fahrenheit and vice versa.
/*#include <iostream>
using namespace std;
int main(){
    float c,f;
    cout<<"enter temperature in celsius:";
    cin>>c;
    f=(c*9/5)+32;
    cout<<"temperature in fahrenheit is:"<<f<<endl;
    cout<<"enter temperature in fahrenheit:";
    cin>>f;
    c=(f-32)*5/9;
    cout<<"temperature in celsius is:"<<c<<endl;
return 0;
}*/



//Write a program to calculate the area of a circle.
/*#include <iostream>
using namespace std;
int main(){
    float r,area;
    float pi=3.14;
    cout<<"enter radius of circle:";
    cin>>r;
    area=pi*r*r;
    cout<<"area of circle is:"<<area<<endl;
return 0;

}*/