Project Implementation

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

struct info
{
    char passportNumber[30];
    char name[30];
    char destination[30];
    char email[30];
    int phone;
} x[100];

int n,i,j=0,a=0,sum=0,g,flag,num;
void read();
void reserve();
void display();
void search();
void edit();
void cancel();
void show();
int main()
{
    read();
    int c,i,q;
    printf("\n\n\t\t ********************************************************************");
    printf("\n\t\t                   welcome to Murad's airline system                   ");
    printf("\n\t\t   *******************************************************************");
    int m,n;

    while(c!=6)
    {
        fflush(stdin);
        printf("\n\n\n\t\t Please enter your option from below (1-4):");
        printf("\n\n\t\t 1. Reservation");
        printf("\n\n\t\t 2. DISPLAY RECORDS");
        printf("\n\n\t\t 3. Search RECORDS");
        printf("\n\n\t\t 4. Edit RECORDS");
        printf("\n\n\t\t 5. Cancel");
        printf("\n\n\t\t 6. EXIT");
        printf("\n\n\t\t feel free to contact ");
        printf("\n\n\t\t Enter your option :");
        scanf("%d",&c);//choice for option
        fflush(stdin);//making it clear
        if(c==1)//reserve
        {
            system("cls");
            reserve();
        }
        else if(c==2)//view
        {
            system("cls");
            display();
        }
        else if(c==3)//search
        {
            system("cls");
            search();
        }
        else if(c==4)//edit
        {
            system("cls");
            edit();
        }
        else if(c==5)//cancel
        {
            system("cls");
            cancel();
        }
        else if(c==6)
        {
            write();
            return 0;
        }
        else
        {
            system("cls");
            printf("\n\nInvalid input , try again by using valid inputs");
        }
        printf("\n\n");
    }
}
void reserve()
{
    printf("\n\n");
    printf("Already Reserved Seats =%d\n\n",num);//how many inputs
    printf("How many Seats do you want to reserve=\n");
    scanf("%d",&n);
    sum=n+num;

    for(i=num,j=0; i<sum; i++)
    {
        printf("\n");
        fflush(stdin);
        printf("Enter Passport Number = ");
        gets(x[i].passportNumber);
        fflush(stdin);
        printf("Enter Name = ");
        gets(x[i].name);
        fflush(stdin);
        printf("Enter the Destination = ");
        gets(x[i].destination);
        fflush(stdin);
        printf("Enter Email Address = ");
        gets(x[i].email);
        fflush(stdin);
        printf("Enter phone number = ");
        scanf("%d",&x[i].phone);
        fflush(stdin);
        printf("\n");
        j++;
        a++;
        num++;
        system("cls");
    }
}

void display()
{
    for(i=0; i<num; i++)
    {
        printf("\n");
        printf("Seat Number= A-%d\n",i);
        printf("Passport = ");
        puts(x[i].passportNumber);
        printf("Name = ");
        puts(x[i].name);
        printf("Destination = ");
        puts(x[i].destination);
        printf("Email Address = ");
        puts(x[i].email);
        printf("Phone number = 0%d\n",x[i].phone);
        printf("\n\n");
        fflush(stdin);
    }
}
void edit()
{
    int q,p;
    fflush(stdin);
    printf("What do you want to edit ?\n");
    printf("Enter your option\n");
    printf("1.Passport Number\n2.Name\n3.Destination\n4.Email Address\n5.Phone no.\n");
    printf("Option=");
    scanf("%d",&q);//option
    if(q<=5)
    {
        printf("Enter the seat no of that passenger= A(0 - %d)=",num-1);
        scanf("%d",&p);//seat number
        if(p<num)
        {
            if(q==1)
            {
                fflush(stdin);
                printf("Enter the new Passport Number=");
                gets(x[p].passportNumber);

            }
            else if(q==2)
            {
                fflush(stdin);
                printf("Enter the new Name=");
                gets(x[p].name);
            }
            else if(q==3)
            {
                fflush(stdin);
                printf("Enter the new Destination=");
                gets(x[p].destination);
            }

            else if(q==4)
            {
                fflush(stdin);
                printf("Enter the new Email Address=");
                gets(x[p].email);
            }

            else if(q==5)
            {
                fflush(stdin);
                printf("Enter the new Phone no =");
                scanf("%d",&x[p].phone);
            }
        }
        else
        {
            printf("\n\nInvalid Seat \nTry Again !!\n\n");
        }
    }
    else
    {
        printf("\n\nInvalid option\nTry Again!!\n\n");
    }
}
void search()
{
    int s,h,f;
    char u[100];
    printf("By what do you want to search ?\n");
    printf("1.Seat no.\n2.passport Number\n3.Name\n4.Destination.\n5.Phone no.\n6.Email address\n\nOption = ");
    scanf("%d",&h);
    if(h==1)
    {
        printf("Enter Seat number of the passanger= A-");
        scanf("%d",&s);
        if(s<num)
        {
            printf("\n");
            printf("Seat Number= A-%d\n",s);
            printf("Passport Number = ");
            puts(x[s].passportNumber);
            printf("Name = ");
            puts(x[s].name);
            printf("Destination = ");
            puts(x[s].destination);
            printf("Email Address = ");
            puts(x[s].email);
            printf("Phone number = 0%d",x[s].phone);
            printf("\n\n");
        }
        else
            printf("\n\nNot Found\n\n");
    }
    else if(h==2)//problem is here.........
    {
        int f=1;
        fflush(stdin);
        printf("Enter your passport Number=");
        gets(u);
        fflush(stdin);
        for(g=0; g<num; g++)
        {
            if(strcmp(u,x[g].passportNumber)==0)
            {
                printf("\n");
                printf("Seat Number= A-%d\n",g);
                printf("Passport Number = ");
                puts(x[g].passportNumber);
                printf("Name = ");
                puts(x[g].name);
                printf("Destination = ");
                puts(x[g].destination);
                printf("Email Address = ");
                puts(x[g].email);
                printf("Phone number = 0%d",x[g].phone);
                printf("\n\n");
                f=0;

            }
        }
        if(f==1)
            printf("\nNot Found\n");



    }
    else if(h==3)
    {
        int f=1;
        fflush(stdin);
        printf("Enter Name = ");
        gets(u);
        fflush(stdin);
        for(g=0; g<num; g++)
        {
            if(strcmp(u,x[g].name)==0)
            {
                printf("\n");
                printf("Seat Number= A-%d\n",g);
                printf("Passport Number = ");
                puts(x[g].passportNumber);
                printf("Name = ");
                puts(x[g].name);
                printf("Destination = ");
                puts(x[g].destination);
                printf("Email Address = ");
                puts(x[g].email);
                printf("Phone number = 0%d",x[g].phone);
                printf("\n\n");
                f=0;
            }


        }
        if(f==1)
            printf("\nNot Found\n");


    }
    else if(h==4)
    {
        int f=1;
        fflush(stdin);
        printf("Enter Destination = ");
        gets(u);
        fflush(stdin);
        for(g=0; g<num; g++)
        {
            if(f==x[g].destination)
            {
                printf("\n");
                printf("Seat Number= A-%d\n",g);
                printf("Passport Number = ");
                puts(x[g].passportNumber);
                printf("Name = ");
                puts(x[g].name);
                printf("Destination = ");
                puts(x[g].destination);
                printf("Email Address = ");
                puts(x[g].email);
                printf("Phone number = 0%d",x[g].phone);
                printf("\n\n");
                f=0;
            }

        }
        if(f==1)
            printf("Not Found\n\n");

    }
    else if(h==5)
    {
        int f=1;
        printf("Enter Phone number = ");
        scanf("%d",&f);
        for(g=0; g<num; g++)
        {
            if(f==x[g].phone)
            {
                printf("\n");
                printf("Seat Number= A-%d\n",g);
                printf("Passport Number = ");
                puts(x[g].passportNumber);
                printf("Name = ");
                puts(x[g].name);
                printf("Destination = ");
                puts(x[g].destination);
                printf("Email Address = ");
                puts(x[g].email);
                printf("Phone number = 0%d",x[g].phone);
                printf("\n\n");
                f=0;
            }

        }
        if(f==1)
            printf("Not Found");
    }
    else if(h==6)
    {
        int f=1;
        fflush(stdin);
        printf("Enter Email Address = ");
        gets(u);
        fflush(stdin);
        for(g=0; g<num; g++)
        {
            if(f==x[g].email)
            {
                printf("\n");
                printf("Seat Number= A-%d\n",g);
                printf("Passport Number = ");
                puts(x[g].passportNumber);
                printf("Name = ");
                puts(x[g].name);
                printf("Destination = ");
                puts(x[g].destination);
                printf("Email Address = ");
                puts(x[g].email);
                printf("Phone number = 0%d",x[g].phone);
                printf("\n\n");
                f=0;
            }

        }
        if(f==1)
            printf("Not Found\n\n");

    }
    else
        printf("\n\nInvalid input\n\n");




}
void cancel()
{
    int f,h;
    printf("Enter the seat number of the passenger that you want to delete=");
    scanf("%d",&f);
    if(f<num)
    {
        printf("What do you want ?\n");
        printf("1.Cancel the whole Reservation\n2.Remove Passport Number\n3.Remove Name\n4.Remove Destination\n5.Remove Email\n6.Remove phone number\nOption = ");
        scanf("%d",&h);
        if(h==1)
        {
            while(f<num)
            {
                strcpy(x[f].passportNumber,x[f+1].passportNumber);
                strcpy(x[f].name,x[f+1].name);
                strcpy(x[f].destination,x[f+1].destination);
                strcpy(x[f].email,x[f+1].email);
                x[f].phone=x[f+1].phone;
                f++;
            }
            num--;
        }
        else if(h==2)
        {
            strcpy(x[f].passportNumber,"Cleared");

        }
        else if(h==3)
        {
            strcpy(x[f].name,"Cleared");
        }
        else if(h==4)
        {
            strcpy(x[f].destination,"Cleared");
        }
        else if(h==5)
        {
            strcpy(x[f].email,"Cleared");
        }
        else if(h==6)
        {
            x[f].phone=0;
        }

    }
    else
        printf("\n\nInvalid Seat number\n");

}
void read()
{
    FILE *fp = fopen("Passanger.txt","r");
    if(fp == NULL)
    {
        //create empty file, so that we can open it
        //in the next execution of this program
        fp = fopen("passanger.txt","w");
        fclose(fp);
        printf("File does not exist\n");
        printf("Let me Create a file for you\n\n\n");
        return 0;
    }

    num = fread(x, sizeof(struct info),100, fp);
    fclose(fp);
}
void write()
{
    FILE *fp = fopen("passanger.txt","w");
    if(fp == NULL)
    {
        printf("Error 402");
        exit(1);
    }
    fwrite(x, sizeof(struct info),num, fp);

    fclose(fp);
}