[opensuse] c - Segmentation fault on 11.4 - need help figuring out (strtod?)

Guys,

Helping my son with a simple little area program, I am running into a segmentation fault after program execution. It seems to be with the strtod conversion, but I can't figure out why. It compiles without issue and executes fine, but then I get a Segmentation Fault error after the program ends. The code is:

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

int main (int argc, char *argv[]) {

if (argc < 2) {
fprintf(stderr, "\nERROR: Usage: %s radius list\n", argv[0]);
fprintf(stderr, "\n example: %s 4 16 21 8 for area calculations\n\n", argv[0]);
exit (1);
}

char *p;
int i;
double rad;
double area;

for (i=1;i<=argc;i++) {
rad = strtod(argv[i],&p);
area = M_PI*rad*rad;
printf(" rad : %5.2f area : %10.4f\n", rad, area);
}

return 0;
}

It compiles without error on 11.4 (x86_64) with:

gcc -Wall ztst.c -o ztst

It seems to run fine:

13:22 alchemy:~/dev/prg/ccpp/src-c/misc> ./ztst 1 2 3 4
rad : 1.00 area : 3.1416
rad : 2.00 area : 12.5664
rad : 3.00 area : 28.2743
rad : 4.00 area : 50.2655
Segmentation fault

So where is this segfault coming from? I have experimented and commented out of the strtod function and just hard coded values for rad (i.e.: rad = (double) i;) and it runs without a segfault. Am I doing something wrong with the strtod call? What say the experts?

--
David C. Rankin, J.D.,P.E.
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