How to save data to a file using FILES in C

How to save data to a file using FILES in C???

pls show me some formats...

Code:

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#include <stdio.h>
#include <fcntl.h>
#include <string.h>

typedef int FLIES;

int main (int argc, char *argv[]) {
        char content[]="data";
        FLIES away=open(argv[1],O_WRONLY | O_CREAT), x=1;

        if (!(argv[1])) { puts("You didn't specify a filename."); return -1; }
        if (write(away,content,strlen(content))<3) perror("write");
        close(away);               
        return 0;
}

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