Thread: square root

Hi
I'm a newbie, I'm trying to understand c programing language. But I have an issue. Why do I get this error?
rootsquer.c

Code:

#include <math.h>
#include <stdio.h>

int main() {
   double number, squareRoot;

   printf("Enter a number: ");
   scanf("%lf", &number);

   // computing the square root
   squareRoot = sqrt(number);

   printf("Square root of %.2lf =  %.2lf", number, squareRoot);

   return 0;
}

Code:

$ clang -ansi rootsquer.c -o rootsquer   
/usr/bin/ld: /tmp/rootsquer-fe5919.o: in function `main':
rootsquer.c:(.text+0x41): undefined reference to `sqrt'
clang: error: linker command failed with exit code 1 (use -v to see invocation)