Thread: Help with FIle handling!!!

Friends, this is my code ..m jus trying to store some data as objects of structures in a file. and later retrieve them to do some operations... can someone pls help me wid it?? Thnx!!
The code is kinda huge and messd up...so any help is highly appreciated..

Code:

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

struct source
{
    char lbl[10];
    char opc[10];
    char op[10];
};
struct res
{
    char lbl[10];
    char opc[10];
    char op[10];
    int add;
};
struct symtab
{
    char lbl[20];
    int add;
};
struct symtab t[20],t1[20];
struct res r[20],r1[20];
struct source s[20],s1[20];
int n;

void create()
{
    int i=0,f=0;
    FILE *fp;
    fp=fopen("Input2","w+");
    //f=1;
    for(i=0;i<n;i++)
    {
       //    if(f==1)

     //        fp=fopen("Input.dat","a");

    printf("Please enter label #%d: ",i+1);
//    fflush(stdin);
    scanf("%s",&s[i].lbl);
    printf("Please enter opcode #%d: ",i+1);
    //fflush(stdin);
    scanf("%s",&s[i].opc);
    printf("Please enter operand #%d: ",i+1);
    //fflush(stdin);
    scanf("%s",&s[i].op);
    fwrite(&s[i],sizeof(s),1,fp);

    }
    fclose(fp);
}

void read()
{
    struct source s1[20];
    int i=0;
    FILE *fp1;
    fp1=fopen("Input2","r");

       //    for(i=0;i<=n;i++)
       //    {
          //    fflush(stdin);
           while(fread(&s1[i],sizeof(s1),1,fp1)!=0)
           {
        printf("\n\nLabel : %s\tOpcode : %s\tOperand : %s ",s1[i].lbl,s1[i].opc,s1[i].op);
          i++;
    }
    //}


       fclose(fp1);

}
int x=0;
void process()
{
    FILE *fp,*fp1,*fp2,*fp3,*fp4, *fp5;

    int i,j,k;
    struct source s2[20];
    char lbl[20],opc[20],op[20],opcode[20],label1[20],opc1[20],op1[20],add1;
    fp=fopen("Input2","r");
    fp3=fopen("symtab2","w+");
    printf("\nNow processing file : \n\n");

    for(i=0;i<n;i++)
    {
        fread(&s2[i],sizeof(s2),1,fp);
        printf("\nLabel #%d: ",i+1);
        printf("%s",s2[i].lbl);
        printf("\nOpcode #%d: ",i+1);
        printf("%s",s2[i].opc);
        printf("\nOperand #%d: ",i+1);
        printf("%s",s2[i].op);
        strcpy(lbl,s2[i].lbl);
        strcpy(opc,s2[i].opc);
        strcpy(op,s2[i].op);

        if(strcmp(opc,"start")==0 || strcmp(opc,"START")==0)
            {x=x+atoi(op);}


        if(strcmp(opcode,"RESW")==0)
        {
            x=x+(atoi(op[i])*3);

        }
        else if(strcmp(opcode,"RESB")==0)
        {
            x=x+(atoi(op[i])*1);
        }
        else if(strcmp(opcode,"BYTE")==0)
        {
            x=x+1;
        }
        else
        {
            x=x+3;
        }

        fp2=fopen("output2","w+");
        strcpy(r[i].lbl,lbl);
        strcpy(r[i].opc,opc);
        strcpy(r[i].op,op);
        r[i].add=x;
        fwrite(&r[i],sizeof(r),1,fp2);
        if(lbl!="null" || lbl!="NULL")
        {

               strcpy(t[i].lbl,lbl);
               t[i].add=x;
               fwrite(&t[i],sizeof(t),1,fp3);
        }

    }
    fclose(fp2);
    fclose(fp3);
    fclose(fp);

    printf("Now beginning to display Output Table: \n");
    fp4=fopen("output2","r");
    for(k=0;k<n;k++)
    {
        fread(&r1[i],sizeof(r1),1,fp4);
        strcpy(label1,r1[i].lbl);
        strcpy(opc1,r1[i].opc);
        strcpy(op1,r1[i].op);
    }

    printf("\n\nAdd: %d\tLabel: %s\tOpcode: %s\tOperand: %s",label1,opc1,op1);
    getch();
    fclose(fp4);
    printf("Now beginning to display Symbol Table: \n");
    fp5=fopen("symtab2","r");
    for(k=0;k<n;k++)
    {
        fread(&t1[i],sizeof(t1),1,fp5);
        strcpy(label1,t1[i].lbl);
        add1=t1[i].add;
        printf("\n\nLabel: %s\tAddress: %d",label1,add1);
    }
    fclose(fp5);
    getch();
}




void main()
{
    clrscr();
    printf("Please enter no. of lines: ");
    scanf("%d",&n);
    create();
    //read();
    getch();
    process();
    getch();
}

Give us the details here - what is "messed up"?

Remember, we don't have your files, so running your program to see what's wrong with it, is out of the question. Also, you SHOULD know, already, and be able to tell us.

adak is right
C/C++ Language Programming

Originally Posted by rey

adak is right
C/C++ Language Programming

Senseless post, followed by a plug.

FYI: "conio.h" is a non-standard header, and is only supported on certain systems. Furthermore, it only seems to be used to prevent the console from closing. There are better, portable methods to accomplish this. This "tutorial" is placing needless restrictions on whom will be able to follow along.