Program 4 : Program to find the Area and Perimeter of a Rectange.

#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
int l=20, b=30;
float a,p;
a=l*b;
p=2*(l+b);
printf("Area of rectangle=%.2f", a);
printf("\nPerimeter of rectangle=%.2f", p);
getch();
}


Output
Area of rectangle=600.00
Perimeter of rectangle=100.00

Explanation
"l" denotes to length and "b" denotes to breadth.
Applying the mathematical formula of Area i.e, a=l*b  and perimeter, p=2*(l+b) we got the answer and displayed by the specifier %.2f that will will show the result in two decimal value after the point.
Here a and p are declared as floating number because it may store floating number.