deleting part of file and modyfing it

[mitola]

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
 
struct oseba
{
char ime[20];
char priimek[15];
char ulica[50];
char mesto[50];
char tel_st[10];
short ucni_uspeh;
 
int stevec;
}pod[4];
 
 
 
 
 
void predelaj_osebo(struct oseba pod[],FILE *fd)
{int izbira;int i=0;
    system("cls");
    printf("Kaj zelis storiti z osebo:");
    printf("\n\n1.)Izbrisati");
    printf("\n\n2.)spremeniti");
    printf("\n\n3.)nic\n\n");
    scanf("%d",&izbira);
 
    switch(izbira)
    {
    case 1:    
            printf("Vnesi ime: ");          scanf("%s",pod[i].ime);
                fflush(stdin);
            printf("Vnesi priimek: ");            scanf("%s",pod[i].priimek);
                fflush(stdin);
            printf("Vnesi ucni uspeh: ");   scanf("%d",&pod[i].ucni_uspeh);
                fflush(stdin);
            printf("Vnesi ulico in st: ");  scanf("%[^\n]s",pod[i].ulica);
                fflush(stdin);
            printf("Vnesi ime mesta: ");    scanf("%s",pod[i].mesto);
                fflush(stdin);
            printf("Vnesi tel st: ");          scanf("%[0-9]s",pod[i].tel_st);
                fflush(stdin);
            //fd=fopen("DIJAKI.BIN","r+");
            fseek(fd, -sizeof(struct oseba), SEEK_CUR);
            fwrite(&pod,sizeof(struct oseba),1,fd);
    break;
    case 2: 
    break;
    case 3: 
    break;
    }
}
 

I have a problem in under-under progam with name predelaj_osebo. I dont know how could i delete certain part of the structure without affecting other part of it.
and how could i just modify one part of the structure pod . for excample pod [2].


thanks in advance

[primeSo]

I didn't go throught your code in detail, but roughly know what you want to do.

First of all, for efficiency wise, i want to advice you to pass in the pointer of the structure to the function instead of passing the whole structure one at a time. check this out.

Do you mean that you want to update the value of the variables within your structure? use dot "." operator or "->" short hand operator depends on how you access the sturucture within the function. either instance of the structure or pointer pointing to the instance of the structure. check it out ^.^.