C++ program to calculate area of the circle if the radius is greter than 0

C++ program to calculate the area of the circle if the radius is greater than 0.

C++ program to calculate the area of the circle

//C++ program to calculate area of the circle
#include <iostream>
using namespace std;
 int main() {
   float radius, area_circle;
   // take radius as input
   cout << "Enter the radius of circle: ";
   cin >> radius;
if(radius>0)
{
   area_circle = 3.14 * radius * radius;
   cout << "Area of circle: " << area_circle << endl;
}
   return 0;
}

Output

Enter the radius of circle: 4

Area of circle:50.24

The same program with another style

#include <iostream>
int main()
{
    float radius, area;
    std::cout << "Please Enter the radius of circle : ";
    std::cin >> radius;
    area = 3.14 * radius * radius;
    std::cout << "Please Area of circle with radius "<< radius << " is " << area;
}

 

C++ program to calculate the area of the circle if the radius is greater than 0.

//C++ program to calculate area of the circle
#include <iostream>
using namespace std;
 int main() {
   float radius, area_circle;
t4tutorials:
   // take radius as input
   cout << "Enter the radius of circle: ";
   cin >> radius;
if(radius>0)
{
   area_circle = 3.14 * radius * radius;
   cout << "Area of circle: " << area_circle << endl;
}
		goto t4tutorials;
   return 0;
}

Output

Enter the radius of circle: 4

Area of circle:50.24

Enter the radius of circle:

C++ Exercise | If else Statement

1. calculate the bill
2. character is small, capital or a special character
3. a number is even or odd
4. 0 is a positive or negative number
5. a positive and negative number
6. Enter Range of numbers and replaced them
7. a greater number among three numbers
8. Armstrong Number
9. ASCII code 
10. Find the Maximum value program in C++ (C Plus Plus).
11. maximum number
12. Maximum Number between two numbers 
13. Student Grade
14. the number is divisible by 11 or 5 or not
15. Triangle 
16. a triangle is an equilateral, isosceles or scalene
17. Leap year 
18. character is an alphabet or not
19. Grade Percentage
20. character is an alphabet, digit, or special character
21. character is an uppercase or lowercase.
22. Weekdays
23. a prime or composite number
24. hours and minutes as  AM or PM
25. swap the values of two numbers
26. update even to odd
27. Profit Loss
28. centimeter into meter and kilometer 
29. Triangle 
30. Salary
31. Even odd with goto statement.
32. area of the circle