weird errors gcc: functions like floor(), ceil(), sqrt()

hi!

I just recently started working in linux red hat 9.0 to compile my C programs , I am using the gcc command but the program is giving me weird errors and does not recognize the functions ceil(), floor() and sqrt(), I have tried and added most header files like math.h nad stdlib.h along with stdio.h but I keep getting wried errors like :

/tmp/ccqz1JFE.o(.text+0xba): In function `main':
: undefined reference to `sqrt'
collect2: ld returned 1 exit status

The program is as follows

Code:

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

int main()
{
	double i, j, k;
	for(j = 0.0; j < 1.0; j += 0.1)
		printf("%8.1f", j);
	printf("\n");
	for(i = 0.0; i < 10.0; i += 1.0)
	{
		for(j = 0.0; j < 1.0; j += 0.1)
		{
			k = i + j;
			printf("%8.1f", sqrt(k));
		}
		printf("\n");
	}
	return 0;
}

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weird errors gcc : functions like floor(), ceil(), sqrt()