project x%10==0[2]

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


void clrscr()
{
    system("@cls||clear");
}

struct cnct
{
    char area[109];
    char name[109];
    char mail[109];
    char number_1[100];
    char number_2[109];
};

struct cnct a[1000];
int size=0;


void swap(struct cnct a, struct cnct b)
{
    struct cnct t=a;
    a=b;
    b=t;
}

void sort(int sz)
{
    int ipos=0,jpos=0;
    for(ipos=0; ipos<sz; ipos++)
    {
        for(jpos=ipos+1; jpos<sz; jpos++)
        {
            if(strcmp(a[ipos].area,a[jpos].area)>0)
            {
                struct cnct t=a[ipos];
                a[ipos]=a[jpos];
                a[jpos]=t;
            }
            else if(strcmp(a[ipos].area,a[jpos].area)==0 && strcmp(a[ipos].name,a[jpos].name)>0)
            {
                struct cnct t=a[ipos];
                a[ipos]=a[jpos];
                a[jpos]=t;
            }
        }
    }
}

int main()
{
    FILE *inp;
    FILE *out;
    FILE *usr;
    inp=fopen("input.txt","r");
    usr=fopen("usr.txt","r");
    int n,i=0,j,command,sub,size=0,sub1;
    struct cnct usr_cnct;
    char x[1009],y[1009];

    while(fscanf(inp,"%s",&a[i].area)!=EOF)
    {
        fscanf(inp,"%s",&a[i].name);
        fscanf(inp,"%s",&a[i].mail);
        fscanf(inp,"%s",&a[i].number_1);
        fscanf(inp,"%s",&a[i].number_2);
        i++;
        size++;
    }
    sort(size);
    fclose(inp);
    printf("\n\t ----- Welcome to Contact Manager ------");
    while(1)
    {
        printf("\n\n\n\t\t\tMAIN MENU\n\t\t=====================\n\t\t[1] Add a new Contact\n\t\t[2] Delete a Contact\n\t\t[3] List all Contacts\n\t\t[4] Edit a Contact\n\t\t[5] Search for contact\n\t\t[0] Exit\n\t\t=====================\n\t\t");
        printf("Enter the choice:");
        scanf("%d",&command);
        clrscr();
        if(command==1 || command==2 || command==4 )
        {
            system("COLOR 2F");
            printf("\n\t\t|| Input Type ||\n\t\t[1]From file\n\t\t[2]From console\n\t\t");
            printf("Enter the choice:");
            scanf("%d",&sub);
        }
        if(command==1)
        {
            system("COLOR A0");
            printf("\n\t\tADDING a new contact");
            if(sub==1)
            {
                fscanf(usr,"%s",&usr_cnct.area);
                fscanf(usr,"%s",&usr_cnct.name);
                fscanf(usr,"%s",&usr_cnct.mail);
                fscanf(usr,"%s",&usr_cnct.number_1);
                fscanf(usr,"%s",&usr_cnct.number_2);
            }
            else
            {
                printf("\n\t\tAREA:");
                scanf("%s",&usr_cnct.area);
                printf("\n\t\tName:");
                scanf("%s",&usr_cnct.name);
                printf("\n\t\tMail:");
                scanf("%s",&usr_cnct.mail);
                printf("\n\t\tNumber 1");
                scanf("%s",&usr_cnct.number_1);
                printf("\n\t\tAlternative number:");
                scanf("%s",&usr_cnct.number_2);
            }
            int is=0,f_pos=size,c,qw,d;
            for(is=0; is<size; is++)
            {
                d=strcmp(a[is].area,usr_cnct.area);
                c=strcmp(a[is].name,usr_cnct.name);
                if(c>=0 && d>=0)
                {
                    f_pos=is;
                    break;
                }
            }
            if(strcmp(a[f_pos].name,usr_cnct.name)==0)
                a[f_pos]=usr_cnct;
            else
            {
                for(is=size-1; is>=f_pos; is--)
                    a[is+1]=a[is];
                a[f_pos]=usr_cnct;
                size++;
            }

            inp=fopen("input.txt","w");
            for(i=0; i<size; i++)
            {
                fprintf(inp,"%s\n",a[i].area);
                fprintf(inp,"%s\n",a[i].name);
                fprintf(inp,"%s\n",a[i].mail);
                fprintf(inp,"%s\n",a[i].number_1);
                fprintf(inp,"%s\n",a[i].number_2);
            }
            fclose(inp);
            clrscr();
        }
        else if(command==2)
        {
            system("COLOR 97");
            printf("\n\t\tDELETING A CONTACT");
            if(sub==1)
            {
                fscanf(usr,"%s",&x);
                fscanf(usr,"%s",&y);
            }
            else
            {
                printf("\n\t\tAREA NAME:");
                scanf("%s",&x);
                printf("\n\t\tPerson name:");
                scanf("%s",&y);
            }

            int del_pos=-1,is,c,d;
            for(is=0; is<size; is++)
            {
                d=strcmp(a[is].area,x);
                c=strcmp(a[is].name,y);
                if(c==0 && d==0)
                {
                    del_pos=is;
                    break;
                }
            }
            if(del_pos!=-1)
            {
                for(is=del_pos; is<size; is++)
                    a[is]=a[is+1];
                size--;
            }
            else
                printf("Invalid Input\n");

            inp=fopen("input.txt","w");
            for(i=0; i<size; i++)
            {
                fprintf(inp,"%s\n",a[i].area);
                fprintf(inp,"%s\n",a[i].name);
                fprintf(inp,"%s\n",a[i].mail);
                fprintf(inp,"%s\n",a[i].number_1);
                fprintf(inp,"%s\n",a[i].number_2);
            }
            fclose(inp);
        }
        else if(command==3)
        {
            system("COLOR 0E");
            printf("\n===========================================================");
            printf("\n\t\tViewing all contacts\n");
            for(i=0; i<size; i++)
            {
                printf("\n===========================================================");
                if(i==0)
                    printf("\n===========================================================");
                printf("\n\n\t\tArea: %s\n",a[i].area);
                printf("\n\t\tName: %s\n",a[i].name);
                printf("\n\t\tEmail: %s\n",a[i].mail);
                printf("\n\t\tPhone number: %s\n",a[i].number_1);
                printf("\n\t\tAlternative Phone: %s\n\n",a[i].number_2);
                printf("\n===========================================================");
                if(i==size-1)
                    printf("\n===========================================================");
            }
            printf("\n");
            printf("\n\t\tType anything to go to main menu");
            getchar();
            getchar();
            clrscr();
        }
        else if(command==4)
        {
            system("COLOR B0");
            printf("\n\t\tUpdating Menu");
            if(sub==1)
            {
                fscanf(usr,"%s",&usr_cnct.area);
                fscanf(usr,"%s",&usr_cnct.name);
                fscanf(usr,"%s",&usr_cnct.mail);
                fscanf(usr,"%s",&usr_cnct.number_1);
                fscanf(usr,"%s",&usr_cnct.number_2);
            }
            else
            {
                printf("\n\t\tAREA:");
                scanf("%s",&usr_cnct.area);
                printf("\n\t\tName:");
                scanf("%s",&usr_cnct.name);
                printf("\n\t\tMail:");
                scanf("%s",&usr_cnct.mail);
                printf("\n\t\tNumber 1");
                scanf("%s",&usr_cnct.number_1);
                printf("\n\t\tAlternative number:");
                scanf("%s",&usr_cnct.number_2);
            }
            int is=0,f_pos=size,c,qw,d;
            for(is=0; is<size; is++)
            {
                d=strcmp(a[is].area,usr_cnct.area);
                c=strcmp(a[is].name,usr_cnct.name);
                if(c==0 && d==0)
                {
                    a[is]=usr_cnct;
                    break;
                }
            }

            inp=fopen("input.txt","w");
            for(i=0; i<size; i++)
            {
                fprintf(inp,"%s\n",a[i].area);
                fprintf(inp,"%s\n",a[i].name);
                fprintf(inp,"%s\n",a[i].mail);
                fprintf(inp,"%s\n",a[i].number_1);
                fprintf(inp,"%s\n",a[i].number_2);
            }
            fclose(inp);
            clrscr();
        }
        else if(command==5)
        {
            system("COLOR 20");
            printf("\n\t\tSearching menu");
            printf("\n\t\tSearch by\n\t\t[1].Name and area\n\t\t[2].Search by Number");
            printf("\n\t\tChoose an option: ");
            scanf("%d",&sub);
            if(sub==1)
            {
                printf("\n\t\t|| Input Type ||\n\t\t[1]From file\n\t\t[2]From console\n\t\t");
                printf("Enter the choice:");
                scanf("%d",&sub1);
                if(sub1==1)
                {
                    fscanf(usr,"%s",&x);
                    fscanf(usr,"%s",&y);
                }
                else
                {
                    printf("\n\t\tUser area:");
                    scanf("%s",&x);
                    printf("\n\t\tUser name");
                    scanf("%s",&y);
                }
                int fin_pos=-1,is,c,d;
                for(is=0; is<size; is++)
                {
                    d=strcmp(a[is].area,x);
                    c=strcmp(a[is].name,y);
                    if(c==0 && d==0)
                    {
                        fin_pos=is;
                        break;
                    }
                }
                if(fin_pos!=-1)
                {
                    printf("FOUND!\n===========================================================\n");
                    printf("\tArea: %s\n",a[fin_pos].area);
                    printf("\tName: %s\n",a[fin_pos].name);
                    printf("\tEmail: %s\n",a[fin_pos].mail);
                    printf("\tPhone number: %s\n",a[fin_pos].number_1);
                    printf("\tAlternative number: %s\n===========================================================\n",a[fin_pos].number_2);

                }
                else
                    printf("\n\tInvalid Input\n\t");
                printf("\n\t\tType anything to go to main menu");
                getchar();
                getchar();
                clrscr();
            }
            else
            {
                printf("\n\t\t|| Input Type ||\n\t\t[1]From file\n\t\t[2]From console\n\t\t");
                printf("Enter the choice:");
                scanf("%d",&sub1);
                if(sub==1)
                {
                    //printf("\n\t\tUser Number:")
                    fscanf(usr,"%s",&x);
                    //fscanf(usr,"%s",&y);
                }
                else
                {
                    printf("\n\t\tUser number:");
                    scanf("%s",&x);
                    //scanf("%s",&y);
                }
                int fin_pos=-1,is,c,d;
                for(is=0; is<size; is++)
                {
                    d=strcmp(a[is].number_1,x);
                    if(c==0)
                    {
                        fin_pos=is;
                        break;
                    }
                }
                if(fin_pos!=-1)
                {
                    printf("FOUND!\n===========================================================\n");
                    printf("\tArea: %s\n",a[fin_pos].area);
                    printf("\tName: %s\n",a[fin_pos].name);
                    printf("\tEmail: %s\n",a[fin_pos].mail);
                    printf("\tPhone number: %s\n",a[fin_pos].number_1);
                    printf("\tAlternative number: %s\n===========================================================\n",a[fin_pos].number_2);

                }
                else
                    printf("\n\tInvalid Input\n\t");
                printf("\n\t\tType anything to go to main menu");
                getchar();
                getchar();
                clrscr();

            }
        }

        else
        {
            system("COLOR 4E");
            printf("\n\t\t--Thanks--\n\t");
            break;
        }
    }
    return 0;
}