Input the radius of a circle, and output the area. (The formula for area is PI times r squared, where PI is 3.141592653589793 and r is the radius.)
Here I wrote the code in C programming language. Please comment for further assistance.
#include <stdio.h>
int main()
{
double pi = 3.141592653589793;
double r;
scanf("%lf",&r);
printf("Area: %lf",pi*r*r);
return 0;
}
Input the radius of a circle, and output the area. (The formula for area is PI...
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