#include<stdio.h>

#include<stdlib.h>

int main()

{

        FILE *fp = NULL;

        fp = fopen("test.txt","a+");

        if(fp == NULL)

        {

                printf("cannot open file");

                return -;

        }

        char c[]="22.33,42";

        char d[] = {'','','.','','',',','',''};

        fprintf(fp, "%s\n",c);

        fprintf(fp,"%s\n",d);

        fclose(fp);

        fp = NULL;

        return ;

}