Not sure what I'm doing wrong.

the challenge states: Here is what your output should look like: A ball with a radius of 14.5 inches.

currently your printf looks like this:

printf("%f radius of a ball\n.")

which will output 14.5 radius of a ball. which is incorrect.

you need your printf to output A ball with a radius of 14.5 inches. to do that you need to change your string a bit. see if you can figure it out

your variable declaration is fine, you dont need to change that. it needs to be named radius. your printf needs to change.

remember that a printf statement generally looks like:

printf("some string with a format specifier %f in it", someVariable);

the value of someVariable will be inserted into the string whereever the format specifier is.

the output needs to be A ball with a radius of 14.5 inches. to do that it needs to look like this:

float radius = 14.5;

printf("A ball with a radius of %f inches.", radius);

that will output the correct string.

I changed it to this: float radius_of_a_ball = 14.5 in; printf("%f radius of a ball.\n" radius_of_a_ball);

But it keeps telling me this:

expected ')' printf("%f radius of a ball.\n" radius_of_a_ball); ^ note: to match this '(' printf("%f radius of a ball.\n" radius_of_a_ball); ^ 2 errors generated.