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I've been teaching myself C for a few months when I have time, and I have run into a problem I am not sure how to fix. Specifically, when I try to compile this using gcc, I get: geometry.c:8: error: conflicting types for ‘trapezoid’ geometry.c:7: note: previous declaration of ‘trapezoid’ was here geometry.c:48: error: conflicting types for ‘trapezoid’ geometry.c:7: note: previous declaration of ‘trapezoid’ was here geometry.c:119: error: conflicting types for ‘trapezoid_area’ geometry.c:59: note: previous implicit declaration of ‘trapezoid_area’ was here geometry.c: In function ‘cone_volume’: geometry.c:128: error: called object ‘3.14100000000000001421085471520200371742248535156e+0’ is not a function geometry.c: In function ‘cylinder_volume’: geometry.c:136: error: called object ‘3.14100000000000001421085471520200371742248535156e+0’ is not a function Now, I think I may need to typecast the functions, but again, I am not sure. It looks like it wants to read PI, which I had defined as 3.141, as a function. Is there a way I can avoid using the magic number 3.141 (though it's much less of a magic number than others)? //Geometric formulae #include <stdio.h> #include <math.h> #define PI 3.141 float trapezoid(float b1, float b2, float h); int trapezoid(); float sphere_volume(float r); int sphere(); float cone_volume(float r, float h); int cone(); float pyramid_volume(float b, float h); int pyramid(); float cylinder_volume(float r, float h); int cylinder(); int main(void) { char selection = 0; while(selection != 'q') { printf("\t--Geometric Formulas--\n"); printf("\tSelection an option from the menu: "); scanf("%c", & selection); switch(selection) { case 1: //Trapezoid area printf("%d", trapezoid()); break; c

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