Simple Programs

Code for area of rectangle                                               

#include<stdio.h>
#include<conio.h>
void main()
{
int a,l,b;
printf("Enter length and breadth");
scanf("%d%d",&l,&b);
a=l*b;
printf("Area=%d",a);
getch();
}

Output

Code for area of square

#include<stdio.h>

#include<conio.h>

void main()

{

int a,s;

printf("Enter side of square");

scanf("%d",&s);

a=s*s;

printf("Area=%d",a);

getch();

}

Output

Code for area of circle

#include<stdio.h>

#include<conio.h>

void main()

{

int r;

float a;

printf("Enter radius of circle");

scanf("%d",&r);

a=3.15*r*r;

printf("Area=%f",a);

getch();

}

Output