Write a complete C program that prompts the user to enter the radius of a circle and displays the circumference. Be sure to name the constant P.
What will be an ideal response?
```
int
main(void)
{
double radius, circum;
printf("Please enter radius of circle> ");
scanf("%lf", &radius);
circum = 2 * PI * radius;
printf("The circumference is %.2f.\n", circum);
return (0);
}
]
```
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