#include <stdio.h>int main(){    char tmpname[L_tmpnam];    char *filename;     FILE *tmpfp;    filename = tmpnam(tmpname);    printf("Temporary file name is: %s\n", filename);    tmpfp = tmpfile();    if(tmpfp)        printf("Opened a temporary file OK\n");    else        perror("tmpfile");    exit(0);}