Temp file in C

main.c

#include <stdio.h>

int main()
{
    char b[255];
    FILE *f;

    f = tmpfile();

    fputs("hello mr dj", f);

    rewind(f); //rewind to the beginning of the tmp file.

    fgets(b, 255, f);
    fputs(b, stdout); //or printf("%s\n", b);

    fclose(f);
}