{{keywords>wiki library source code example reference}}
====== strerror ======
<code c>
#include <string.h>
//#include <windows.h> /* uncomment this for Windows */
char *strerror(int errnum);
</code>

=== Description ===
returns a pointer to a string that describes the error code passed in the argument errnum



compile this example with the compiler flag **-lm**
===== strerror C Example Code =====
<code c>
/* 
 * strcspn c example code
 * http://code-reference.com/c/string.h/strerror
 */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <math.h>

int main ( void ) {

double i;
i = sqrt(-1);
printf("sqrt(-1)=%f\n",i);
printf("%s\n", strerror(errno));
return 0;
}

</code>


=== Output of strerror example ===
    sqrt(-1)=-nan
    Numerical argument out of domain