$9\mathrm{.}14$ LAB: Flipping for tails

Given main$()$ and GVCoin struct, complete function FlipForTails$()$ in main.c that counts and returns the number of flips taken to achieve a desired number of tails. Function FlipForTails$()$ has a GVCoin struct and an integer representing the desired number of tails as parameters. Review the GVCoin struct in "GVCoin.h$"$ and the function implementations in "GVCoin.c$"$ by clicking on the orange arrow.

Note: For testing purposes, a GVCoin struct is created in the main$()$ function using a pseudo$-$random number generator with a fixed seed value. The program uses a seed value of $15$ during development, but when submitted, a different seed value will be used for each test case.

Ex: If the GVCoin struct is created with a seed value of $15$ and the desired number of tails is $100,$ then the function FlipForTails$()$ returns $213$ and the program outputs:

Total number of flips for $100$ tails: $213$

#ifndef GVCOIN$\_$H$\_$

#define GVCOIN$\_$H$\_$

#include

#include

typedef struct GVCoin$\_$struct $\{$

bool isHeads;

int flips;

int heads;

$\}$ GVCoin;

GVCoin InitGVCoin$($int seed$)$;

GVCoin Flip$($GVCoin coin$)$;

int NumFlips$($GVCoin coin$)$;

int NumHeads$($GVCoin coin$)$;

int NumTails$($GVCoin coin$)$;

bool IsHeads$($GVCoin coin$)$;

#endif

#include

#include

#include

#include "GVCoin.h$"$

GVCoin InitGVCoin$($int seed$)\{$

srand$($seed$)$;

GVCoin coin;

coin.heads $=0$;

coin.flips $=0$;

coin.isHeads $=1$;

return coin;

$\}$

GVCoin Flip$($GVCoin coin$)\{$

coin.isHeads $=$ rand$()\%2$;

coin.flips$++$;

if $($coin$.$isHeads$)\{$

coin.heads$++$;

$\}$

return coin;

$\}$

int NumFlips$($GVCoin coin$)\{$

return coin.flips;

$\}$

int NumHeads$($GVCoin coin$)\{$

return coin.heads;

$\}$

int NumTails$($GVCoin coin$)\{$

return coin.flips $-$ coin.heads;

$\}$

bool IsHeads$($GVCoin coin$)\{$

return coin.isHeads;

$\}$

#include

#include "GVCoin.h$"$

#include "GVCoin.h$"$

int FlipForTails$($GVCoin coin, int goal$)\{$

int num$\_$flips $=0$;

int num$\_$tails $=0$;

while $($num$\_$tails $<$ goal$)\{$

Flip$($coin$)$;

num$\_$flips$++$;

if $($IsHeads$($coin$))\{$

num$\_$tails$++$;

$\}$

$\}$

return num$\_$flips;

$\}$

int main$()\{$

GVCoin coin $=$ InitGVCoin$(15)$; $//$ Create a GVcoin object with seed value $15$

int numTails $=100$; $//$ Desire $100$ tails

int total $=$ FlipForTails$($coin$,$ numTails$)$; $//$ Should return $213$ using GVcoin object with seed value $15$

printf$("$Total number of flips for $100$ tails: $\%$d

$",$ total$)$;

return $0$;

$\}$