Question

1. Write a program that determines the area and perimeter of a square. Your program should accept the appropriate measurement of the square as input from the user and display the result to the screen.

Area of Square = L (squared)

Perimeter of Square = 4 * L

2.  Write a program that determines the area and circumference of a circle. Your program should accept the appropriate measurement of the circle as input from the user and display the result to the screen.

Area of Circle = pi * radius (squared)

Circumference of Circle = 2 * pi * radius

3. Write a program that determines the area of a triangle and trapezium. Your program should accept the appropriate measurement of the triangle and trapezium as input from the user and display the result to the screen.

Area of Triangle = 1/2 * base * height

Area of Trapezium = (base1 + base2)/ 2 * height

4. Write a program that allows the user enter in 5 numbers representing the salaries of 5 employees, your program should display as output the average salary of the employees.

Answer 1

1)

#include<iostream>
using namespace std;
int main()
{
int L;
cout<<"Enter Side of a Square : ";
cin>>L;
cout<<"Area of Square : "<<L*L<<endl;
cout<<"Perimeter of Square : "<<4*L;
return 0;
}

2)

#include<iostream>
using namespace std;
int main()
{
   float r, area, circum;
   cout<<"Enter the radius of the circle : ";
   cin>>r;
   area=3.14*r*r;
   circum=2*3.14*r;
   cout<<"Area of the circle = "<<area<<endl;
   cout<<"Circumference of the circle = "<<circum<<endl;
   return 0;
}

3)

#include <iostream>
using namespace std;
float areaTrapezium(float a, float b, float h)
{
return (1.0 / 2 * (a + b) * h);
}
float areaTriangle(int b,int h)
{
   return (0.5)*h*b;
}
int main()
{
int base,heightTri;
   float base1,base2,height;
   cout<<"Enter the value of base1 : ";
   cin>>base1;
cout<<"Enter the value of base2 : ";
   cin>>base2;
   cout<<"Enter the height : ";
   cin>>height;
   cout << "Area of Trapezium = " <<
areaTrapezium(base1, base2, height) << endl;
cout<<"Enter the value of base for triangle : ";
   cin>>base;
cout<<"Enter the value of heightTri : ";
   cin>>heightTri;
   cout << "Area of Triangle = " <<
areaTriangle(base, heightTri) << endl;
   return 0;
}

4)

#include <iostream>
using namespace std;
int main()
{
   float salary[5],sum,average;
   cout<<"Enter the salaries of five employees : ";
   for(int i=0;i<=4;i++)
   {
       cin>>salary[i];
       sum=sum+salary[i];
   }
   average = sum/5;
   cout<<"Average salary of five employees is : "<<average<<endl;
   return 0;
}