CODEWITHSUNDEEP
cchardoublestrtod
RajSanpui
RajSanpui

Reputation: 12064

strtod - Problem in converting string to double

I have a very small program which converts a string to double. The problem is everytime it is printing 0.0000. Please help me.

Thanks in advance.

enter code here

$ export LT_LEAK_START=1.5
$ echo $LT_LEAK_START
  1.5

#include <stdio.h>

int main()
{
  double d;
  d=strtod(getenv("LT_LEAK_START"), NULL);
  printf("d = %lf\n",d);
}
Output:
d=0.0000000

Upvotes: 1

Views: 6961

Answers (2)

user237419
user237419

Reputation: 9064

you aren't including the strtod decl header (stdlib.h) so you are using an internal strtod implementation (which seems to be just a stub?)

root@pinkpony:~# gcc -Wall -g  -o t t.c
t.c: In function ‘main’:
t.c:6: warning: implicit declaration of function ‘strtod’
t.c:6: warning: implicit declaration of function ‘getenv’
t.c:8: warning: control reaches end of non-void function
root@pinkpony:~# gdb ./t
Reading symbols from /root/t...done.
(gdb) run
Starting program: /root/t 

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7a96b64 in ____strtod_l_internal (nptr=<value optimized out>, endptr=<value optimized out>, group=<value optimized out>, loc=0x7ffff7dd6580) at strtod_l.c:530
5    30     strtod_l.c: No such file or directory.
        in strtod_l.c
(gdb) bt
#0  0x00007ffff7a96b64 in ____strtod_l_internal (nptr=<value optimized out>, endptr=<value optimized out>, group=<value optimized out>, loc=0x7ffff7dd6580) at strtod_l.c:530
#1  0x00000000004005bc in main () at t.c:6
(gdb)

ignore the sigsegv, on my platform is caused by getenv() which is declared as well in stdlib but has no internal gcc impl

Upvotes: 1

codaddict
codaddict

Reputation: 455142

Try including

#include <stdlib.h>

Upvotes: 7

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