trapezoidal rule

Code:

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I am new to c programing and I had spend 2 days on a program and I can't fix the error:
        gcc Test.c -o Test.exe
/tmp/ccZkbk0V.o: In function `f':
Test.c:(.text+0x2f): undefined reference to `sqrt'
collect2: ld returned 1 exit status

the program I am working in is:

#include <stdio.h>
#include <math.h>
int f(int x){
        return (sqrt(4.0 - x*x));
}
int main(void)
{
        int a, b, N, width, i, sum,value, area;
        printf (" Enter the interval a an b");
        scanf ("%d\n%d\n", &a, &b);
        printf (" Enter the number of trapezoids you would like to use");
        scanf ("%d\n", &N);
        width = (b-a)/N;
        sum=(f(a*a) + f(b*b))/2;
        for (value = a + width; value < b; value += width)
                sum += f(value);
       
        area = sum * width;
        printf (" The area under the curv is %d\n", area);
        return 0;
}
 
can some one help me dig myself out of a hole

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Link to the math library. The math library is called "m" on most GCC and other systems.
The option -lm is what works for most systems; that is a lowercase L not an I.

1st Suggestion to try

Code:

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gcc Test.c -lm -o Test.exe

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2nd Suggestion to try

Code:

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gcc Test.c -o Test.exe -lm

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Tim S.

thanks you for all your help it work