How to use the tmpnam function in c ?

tmpnam.c

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


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

    char tmp_path [L_tmpnam + 1 ];

    tmpnam (tmp_path );
    /*Generate a temp path .*/

    printf ("%s\n" , tmp_path );
    /* Output in Unix like OS :
        /var/tmp/tmp.0.9oxTFK
       Output in windows :
        \s2ro.
       Under windows \ indicates
       that the name is valid under
       the current working directory .*/

    char * tmp_path_1 = tmpnam (NULL );
    printf ("%s\n" , tmp_path_1 );
    /* Output in Unix like OS :
        /var/tmp/tmp.1.Qo9D8Z
       Output in windows :
        \s3rg.1*/
    tmpnam (NULL );
    printf ("%s\n" , tmp_path_1 );
    /* Output in Unix Like OS :
        /var/tmp/tmp.2.wnTK4D
       Output in windows :
        \s3rg.2 */ }