Hey peoples im new to macros and i have seem to have gotten the notation for my VOLUME macro, however i dont know what to do for the PRINTSTR macro which is supposed to ask a string for you to input which will then be outputted onto the next line.
#define VOLUME(r) ((4.0 /3) * 3.14 * (r)*(r)*(r))
#define PRINTSTR(str) printf("%s")
printf("Please enter the radius of a sphere \n");
printf("The volume of the sphere is: %.2f\n", VOLUME(r));
printf("Enter a string you want to print \n");