Question

I am trying to do a simple strrev on a string and I keep getting this error when I compile it on my mac

Undefined symbols for architecture x86_64:
"_strrev", referenced from:
  _main in cc1zSAum.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

My code is:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main(int argc, char *argv[]){
  char str[] = "Hello world";
  char * test;
  test = strrev(str);
  printf("%s",test);
  return 0;
}

I tried playing around with the strrev line
but nothing is working

Any help would be appreciated
Thanks

Answer 1

There’s no standard C function by that name. I did a little Googling and it looks like a few compilers and/or C library implementations have included such a function as a non-standard extension, but you can’t expect any arbitrary library to have one.

Would be simple enough to write your own, though — could be a one line loop body, even.