Question

Activity
1. Write a program to ask user input the radius of a circle and then find its area.
2. Write a program to ask user input the side of a square and then find its area and
perimeter.
3. Write a program to convert meters into centimeters and vice versa. (1 m = 100 cm)
​

Answer 1

1.

class Circle

{

public static void main(String args[])

{

double radius=Double.parseDouble(args[0]);

System.out.println("Area: "+(22/7 * radius * radius));

System.out.println("Perimeter: "+(2 * 22/7 * radius));

}

}

2.

/*

* C Program to calculate area of a square

*/

#include <stdio.h>

#include <conio.h>

int main(){

float side, area;

printf("Enter length of side of square\n");

scanf("%f", &side);

/* Area of Square = Side X Side */

area = side * side;

printf("Area of square : %0.4f\n", area);

getch();

return 0;

}

3.

// C++ program to convert centimeter

// into meter and kilometer

#include <bits/stdc++.h>

using namespace std;

int main()

{

float cm, meter, kilometer;

cm = 1000;

// Converting centimeter into meter

// and kilometer

meter = cm / 100.0;

kilometer = cm / 100000.0;

cout << "Length in meter = " << meter << "m"

<< "\n";

cout << "Length in Kilometer = " << kilometer << "km"

<< "\n";

return 0;

}