i'm stuck

I have a program disk which has a (has a ) relationship with segment. I need to write all the segments stored in the disk to a file, but I'm able to write only the first element in segment instead of all the segment elements contained in disk.

here is a partial code from the disk program.

Code:

---


 #include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "disk.h"

disk::disk(int num_of_segments, const char* mode){

        size_=num_of_segments;
        sgm_ = new segment[size_];  //initializes num_of_segments in a disk
        for(int i=0; i<size_; i++){
                sgm_[i].initialize();
        }

        count_=0;       
        if( strcmp(mode_, "w")!=0||strcmp(mode_, "a")!=0){
                //mode="w";
                strcpy(mode_, "w");
        }
        printf("the mode is set to %s, and the #ofsegments is %d\n", mode_, num_of_segments);

}

disk::disk(){

        sgm_ = new segment[20]; //initialize 20 segments in a disk
        for(int i=0; i<20; i++){
                sgm_[i].initialize();
        }
        size_=20;  //keeps track of how many are initialized
        count_=0;  //keeps track of how many are added
        strcpy(mode_, "w"); //initialize disk access mode to w
       
}

disk::~disk(){

      delete[] sgm_;
}

const char* disk::get_mode() const{

        return mode_;
}

segment disk::get_segment(int pos) const{

        return sgm_[pos];       
}

int disk::get_segment_count() const{

        return count_;   
}

const segment* disk::get_all_segments() const{

        return sgm_;             
}

int disk::access (const char fname[]){

        int char_count=77;
        int actual_count=0; //just to pass the tests.
        char c;

        //printf("the file name is %s, and the mode is %s\n", fname, mode_);
        if(strcmp(mode_, "w")==0){
                printf("sgm to be written is %s\n", sgm_);
                fp=fopen(fname, "w");
                fprintf(fp, "%s\n",sgm_);
                fclose(fp);
        }     
        if(strcmp(mode_,"a")==0){
                fp=fopen(fname, "a");
                fprintf(fp, "%s\n", sgm_);
                fclose(fp);
        }

        fp=fopen(fname, "r");
       
        do{
                c=fgetc(fp);
                if(c!=' ' && c!='\n')
                        actual_count++;
               
        }while(c!=EOF);
        fclose(fp);
       
       
        return actual_count;       

}

---

I can't seem to return all of the segment array elements in this fn ->const segment* disk::get_all_segments() const. to be written to a file. I was hoping someone could shed light on how I might possibly solve this problem.

thanx

sqm_ is a pointer to an array of segments, to read or write all segments you will need to loop from sqm_[0] to sqm_[count_-1] and perform the correct operation on each. The C++ way to do this is to overload the segment types ostream << operator and istream >>. keeping with your mixed theme you would probably want .read(FILE *) and .write(FILE *) methods to be added to segment.

Code:

---

int disk::access (const char fname[]){
//...
        char c;
//...
        do{
//...
        }while(c!=EOF);
//...
}

---

EOF is an int value - you can't store it in a char.
FAQ > Explanations of... > Definition of EOF and how to use it effectively