Arch Linux

mcool4151

Member

Registered: 2013-05-09

Posts: 37

[SOLVED]math.h sqrt error

I wrote a program that uses sqrt function from math.h header file

here's the source code

//sqrtchk.c
#include<stdio.h>
#include<math.h>
int main()
{
int a;
double b;
puts("Enter a number that is greater than 0:");
scanf("%d",&a);
b=sqrt((double)a);
printf("Square Root is %lf",b);
return(0);
}

i compiled it with this command and got this error

[mcool@ArchLinux tests]$ gcc sqrtchk.c -o sqrt
/tmp/ccagMCOp.o: In function `main':
sqrtchk.c:(.text+0x30): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status

what should i do?

Last edited by mcool4151 (2013-05-19 12:50:11)

jakobcreutzfeldt

Member

Registered: 2011-05-12

Posts: 1,041

Re: [SOLVED]math.h sqrt error

You need to link to libm. Add "-lm" to your options.

mcool4151

Member

Registered: 2013-05-09

Posts: 37

Re: [SOLVED]math.h sqrt error

Thanks.......

fsckd

Forum Fellow

Registered: 2009-06-15

Posts: 4,173

Re: [SOLVED]math.h sqrt error

Welcome to the forums mcool4151.

Moving from Applications & Desktop Environments to Programming & Scripting.

---

aur S & M :: forum rules :: Community Ethos
Resources for Women, POC, LGBT*, and allies