How to create a Bus Reservation System using C

Problem:

How to create a Bus Reservation System using C

Code:

#include<stdio.h>
#include<conio.h>
#include<string.h>
char name[20];
void main()
{
    int b;
    clrscr();
    printf("\n*******WELCOME TO BUS RESERVATION SYSTEM************");
    printf("\nEnter passenger name:");
    scanf("%s",&name);
    printf("\nMENU\n1.Seats Available\n2.Cost of Journey\n3.exit");
    scanf("%d",&b);
    switch(b)
    {
    case 1:
    seat();
    break;
    case 2:
    cost();
    break;
    case 3:
    exit(0);
    default:
    printf("\nYou entered wrong choice");
    }
    getch();
}
seat()
{
    long int n,b,a,d;
    printf("\nmr.%s\nEnter the Bus Number",name);
    scanf("%ld",&n);
    if(n>2564123 && n<9740213)
    {
    b=(n%1000)+(n%100)+(n%10);
    printf("\nmr.%s\nThe available seats in bus are:%d",name,b);
    }
    else
    {
    printf("\nmr.%s\nYou entered wrong bus number",name);
    printf("\nmr.%s\nPlease select from Menu\nEnter 1 to check bus numbers\n2 to Exit",name);
    scanf("%ld",&a);
    if(a==1)
    {
    for(d=2564123;d<9740213;d=d+25)
    {
    printf("\n%ld",d);
    }
    }
    else if(a==2)
    {
    exit(0);
    }
    else
    {
    printf("\nmr.%s\nYou entered Wrong Choice",name);
    }
    }
}
cost()
{
    int a,b,c;
    char to[10],from[10];
    printf("\nFROM:");
    scanf("%s",&from);
    printf("\nTO:");
    scanf("%s",&to);
    a=strlen(to);
    b=strlen(from);
    c=((a*b)+(a*b)+(a+2)*(b+2))*2;
    printf("\nmr.%s\nCost of Journey from %s to %s is %d",name,from,to,c);

}