CS50 - Compiling Issues

user_14285602 0
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I am currently taking the cs50 Harvard course via EDX and am working on the Cash/Greedy Algorithm problem from PSET1/Week1. I have it all written out and I keep getting this error;

~/pset1/ $ clang -o cash cash.c -lcs50
/tmp/cash-4f9816.o: In function `main':
cash.c:(.text+0x44): undefined reference to `round'
clang-7: error: linker command failed with exit code 1 (use -v to see invocation)

Here is my code.

#include <cs50.h>
#include <stdio.h>
#include <math.h>
int main(void)
    {

float dollars;
do
{
    dollars = get_float("Change: ");
}
while (dollars <= 0);


int cents = round(dollars * 100);
int coins = 0;

while (cents >= 25)
{
    coins ++;
    cents -= 25;
}


while (cents >= 10)
{
    coins ++;
    cents -= 10;
}


while (cents >= 5)
{
    coins ++;
    cents -= 5;
}


while (cents >= 1)
{
    coins ++;
    cents -= 1;
}

printf("You Will Receive %i Coin(s)\n)", coins);
 }

Can someone help me figure this out without breaking the Harvard honor code?

cs50 c
2 Answers

Use make cash. It will link both libraries (math and cs50).

In your compiling command, you link only cs50 library with -lcs50. Round function comes within library math. That's why compiler fails in finding reference to round.

There are some good sources to understand why undefined reference to occurs.

user_110003820

You are not linking the math library in your clang command either add a -lmath or use the make command.

user_148830780
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