# C++ Exercises: Accepts the radius of a circle from the user and compute the area and circumference

## C++ Basic: Exercise-43 with Solution

Write a C++ program that accepts the radius of a circle from the user and computes the area and circumference.

**Pictorial Presentation:**

**Sample Solution**:

**C++ Code :**

```
#include <iostream>
#define PI 3.14159
using namespace std;
int main()
{
float radius, area, circum;
cout << "\n\n Find the area and circumference of any circle :\n";
cout << "----------------------------------------------------\n";
cout<<" Input the radius(1/2 of diameter) of a circle : ";
cin>>radius;
circum = 2*PI*radius;
area = PI*(radius*radius);
cout<<" The area of the circle is : "<< area << endl;
cout<<" The circumference of the circle is : "<< circum << endl;
cout << endl;
return 0;
}
```

Sample Output:

Find the area and circumference of any circle : ---------------------------------------------------- Input the radius(1/2 of diameter) of a circle : 5 The area of the circle is : 78.5397 The circumference of the circle is : 31.4159

**Flowchart: **

**C++ Code Editor:**

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**Previous:** Write a language program in C++ which accepts the user's first and last name and print them in reverse order with a space between them.

**Next:** Write a language program to get the volume of a sphere with radius 6.

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## C++ Programming: Tips of the Day

**Why is there no std::stou? **

The most pat answer would be that the C library has no corresponding "strtou", and the C++11 string functions are all just thinly veiled wrappers around the C library functions: The std::sto* functions mirror strto*, and the std::to_string functions use sprintf.

Ref: https://bit.ly/3wtz2qA

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