#include<stdio.h>
#include<conio.h>
#include<ctype.h>
FILE *fptr;
void writedetails();
void readdetails();
void main(){
    int ch;
    do{
    printf("Enter 1 to write details of clients.");
    printf("nEnter 2 to read details of clients with 0 balance.");
    printf("nEnter 3 to exit.");
    printf("nEnter your choice:");
    scanf("%d",&ch);
    if(ch==1){
        writedetails();
    }
    else if(ch==2){
        readdetails();
    }
    else if(ch==3){
        exit(0);
    }
    }while(ch!=3);
    getch();
}
void writedetails(){
    char name[20];
    int ac_no;
    int bal;
    char ch2 = 'y';
    fptr = fopen("CLIENTS.DAT","w");
    while(toupper(ch2) == 'Y'){
        printf("nEnter the details of client:");
        printf("nAccount no: ");
        scanf("%d",&ac_no);
        printf("Name: ");
        scanf("%s",&name);
        printf("Balance: ");
        scanf("%d",&bal);
        fprintf(fptr,"%d %s %d",ac_no,name,bal);
        printf("Press 'Y' to continue or any other key to stop.n");
        ch2 = getche();
    }
    fclose(fptr);
}
void readdetails(){
    char name[20];
    int ac_no;
    int bal;
    printf("nDetails of all clients with 0 balance:n");
    printf("nA/C no--------Name-------Balance");
    printf("n--------------------------------n");
    fptr = fopen("CLIENTS.DAT","r");
    while((fscanf(fptr,"%d%s%d",&ac_no,&name,&bal))>0){
        if(bal==0){
            printf("n %6d t %-20s %6d",ac_no,name,bal);
        }
        printf("nn");
    }
    fclose(fptr);
}