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$/$usr$/$bin$/1$d: $/$tmp$/$cc$51$yJM$8.$o: in function 'main':

main.cpp:$(.$text$+0$x$160)$: undefined reference to 'calculateCoinValue$($int$,$ int, int, double$)\text{'}$

$/$usr$/$bin$/$ld: main.cpp:$(.$text$+0$x$190)$: undefined reference to $*$calculateCoinValue$($int$,$ int, int, double$)\text{'}$

$/$usr$/$bin$/$ld: main.cpp:$(.$text$+0$x$1$c$0)$: undefined reference to $*$calculateCoinValue$($int$,$ int, int, double$)\text{'}$

$/$usr$/$bin$/$ld: main.cpp:$(.$text$+0$x$1$f$5)$: undefined reference to 'calculateTotal$($double$,$ double, double$)\text{'}$

collect$2$: error: ld returned $1$ exit status