/*A Program to Multiply Two Matrices. */

#include <stdio.h>
#define MAXROWS 100
#define MAXCOLS 100

void Read(int a[][MAXCOLS],int m,int n);
void Compute(int a[][MAXCOLS],int b[][MAXCOLS],int c[][MAXCOLS],int m,int n,int p);
void Print(int c[][MAXCOLS],int m,int p);

void main()
{

    int nrows, ncols, mrows, mcols;
    int a[MAXROWS][MAXCOLS],b[MAXROWS][MAXCOLS],c[MAXROWS][MAXCOLS];
    
    printf("Enter Number Of Rows In Matric A: ");
    scanf("%d",&nrows);
    
    printf("Enter Number Of Rows In Matric A: ");
    scanf("%d",&ncols);
    
    printf("Enter Number Of Rows In Matric B: ");
    scanf("%d",&mrows);
    
    printf("Enter Number Of Rows In Matric B: ");
    scanf("%d",&mcols);
    
    if (ncols != mrows)
    {
        printf("\n\t\tSorry! You Can"t Multiply Matric A And B.");
        getch();
exit(0);
    }

    printf("\n\t\t\tFirst Matric\n");
    Read(a,nrows,ncols);
    
    printf("\n\t\t\tSecond Matric\n");
    Read(b,mrows,mcols);
    
    Compute(a,b,c,nrows,ncols,mcols);
    
    printf("Product Of The Matrices Is:");
    Print(c,nrows,mcols);
    
    getch();
}


void Read(int a[][MAXCOLS],int m,int n)
{
    int row, col;
    for (row=0;row<m;row++)
    {   
        printf("Enter Data For Row No.%d:\n",row+1);
        
        for (col=0;col<n;col++)
            scanf("%d",&a[row][col]);
    }
return;
}


void Compute(int a[][MAXCOLS],int b[][MAXCOLS],int c[][MAXCOLS],int m,int n,int p)
{
    int i, j, k, sum=0;
    
    for (i=0;i<m;i++)
    {
        for (j=0;j<p;j++)
        {
            for (k=0;k<n;k++)
            {
                sum=sum+(a[i][k]*b[k][j]);
                c[i][j]=sum;
                sum=0;
            }
        }
    }
return;
}


void Print(int c[][MAXCOLS],int m,int p)
{
    int row, col;
    printf("\n");
    for (row=0;row<m;row++)
    {
        for (col=0;col<p;col++)
        {
            printf("%5d",c[row][col]);
            printf("\t");
        }
        printf("\n");
    }
return;
}

#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<string.h>
 
//===========================
//===========================
class book
{
 friend class library;
 
 private:
    char book_name[11];
    char explain[51];
    char aouther[11];
    char 



	part

 ;
 
    char user[11];    
     int reserved;
 
    book *next;
 
 public:
         book();
    void edit();
    void reserv();
    void getback();
}
//---------------------------
     book::book()
    {
     clrscr();
 
     cout<<"============ add a new book =================="
         <<"\n\nto insert new book ,enter flow informations:"
         <<"\n\nbook name?";
     gets(book_name);
     book_name[10]=NULL;
 
     cout<<"\naouther name?";
     gets(aouther);
     aouther[10]=NULL;
 
     cout<<"\nany explain?";
     gets(explain);
     explain[50]=NULL;
 
     



	part

 =book_name[0];
 
     reserved=0;
 
     next=NULL;
 
     cout<<"\n\ninformathions set!";
     getch();
    }
//---------------------------
void book::edit()
    {
cout<<"error ";
    }
//---------------------------
void book::reserv()
    {
     clrscr();
     cout<<"\n=========== reserving book ===================";
 
     if(reserved==0)
        {
         cout<<"\n\nuser name?";
         gets(user);
         user[11]=NULL;
 
         reserved=1;
        }
 
     if(reserved==0)
        {
         cout<<"\n\nsorry! book has been reserved befor"
             <<"by user:";
         puts(user);
        }
 
     getch();
    }
//---------------------------
void book::getback()
    {
     reserved=0;
 
     cout<<"\n\nbook got bak.";
     getch();
    }
//===========================
//===========================
class library
{
 public:
          library();
     void run_menu();
 
 private:
     book *parts[24];
     void insert(book*);
     void find();
     void search();
 
}
//---------------------------
     library::library()
    {
     for(int i=0;i<=23;i++)
        parts[i]=NULL;
 
    }
//---------------------------
void library::run_menu()
    {
 
     char ch="n";
 
     while(ch!="4")
        {
         clrscr();
 
         cout<<"================= LIBRARY =================="
             <<"\n\n1:add a new book."
             <<"\n2:find a book."
             <<"\n3:search a book."
             <<"\n4:exit."
             <<"press numbers:";
 
 
         ch=getch();
 
 
         if(ch=="1")
            {
             book *n=new book;
             insert(n);
            }
         if(ch=="2")
            {
             find();
            }
         if(ch=="3")
            {
             search();
            }
 
        }//while
    }
//---------------------------
void library::insert(book *s)
    {
     int d=s->part-97;
 
     if(parts[d]==NULL)
        {
         parts[d]=s;
        }
     else
        {
         book *p=parts[d],*q;
         while(p!=NULL && strcmp(p->book_name,s->book_name)<0)
            {
             q=p;
             p=p->next;
            }
         q->next=s;
         s->next=p;
        }
 
    }
//---------------------------
void library::find()
    {
     clrscr();
 
     cout<<"=========== edit / delete books ============"
         <<"\nenter exact book name:";
     char name[11];
     gets(name);
     name[11]=NULL;
     int d=name[0]-97;
 
     book *p=parts[d],*q;
     while(p!=NULL && strcmp(p->book_name,name)!=0)
        {
         q=p;
         p=p->next;
        }
     if(p==NULL)
        {
         cout<<"not found!";
        }
     if(p!=NULL)
        {
         cout<<"\n\ndelete it?("d")  or edit?("e")"
             <<"  or reserv?("r")   or getback?("g") :";
         char ch=getch();
         if(ch=="d")
             {
              q->next=p->next;
              delete p;
             }
         if(ch=="e")
             {
              p->edit();
             }
         if(ch=="r")
             {
              p->reserv();
             }
         if(ch=="g")
            {
             p->getback();
            }
        }
     getch();
    }
//---------------------------
void library::search()
    {
     char ch="6";
 
     while(ch!="4")
        {
         clrscr();
         cout<<"================== SEARCH ===================";
         cout<<"\n\n1:search for name."
             <<"\n2:search for aouther."
             <<"\n3:search for explanations."
             <<"\n4:back to main menu.(press numbers)";
 
         ch=getch();
 
         if(ch=="1")
            {
             cout<<"\n\nenter exact name:";
             char name[10];
             gets(name);
             name[11]=NULL;
 
             int d=name[0]-97;
             book *p=parts[d];
             while(p!=NULL && strcmp(p->book_name,name)!=0)
                {
                 p=p->next;
                }
             if(p==NULL)
                {
                 cout<<"\nnot founded!";
                }
             else
                {
                 cout<<"\n\n";
                 cout<<"name:";puts(p->book_name);
                 cout<<"aouther:";puts(p->aouther);
                 cout<<"explain:";puts(p->explain);
                 if(p->reserved==1)
                    {
                     cout<<"RESERVED by:";
                     puts(p->user);
                    }
                 else
                    {
                     cout<<"NOT RESERVES";
                    }
                }//else
             getch();
            }//1
         if(ch=="2")
            {
             cout<<"\n\nenter exact aouther name:";
             char name[11];
             gets(name);
             name[11]=NULL;
             int f=0;
 
             for(int i=0;i<=23;i++)
               {
                book *p=parts[i];
                while(p!=NULL)
                {
                 if(strcmp(p->aouther,name)==0)
                    {
                     f++;
                     cout<<"\n"<<f<<":";
                     cout<<"name:";puts(p->book_name);
                     cout<<"aouthor:";puts(p->aouther);
                     cout<<"explain:";puts(p->explain);
                     if(p->reserved==1)
                        {
                         cout<<"RESERVED BY";
                         puts(p->user);
                        }
                     else
                        {
                         cout<<"NOT RESERVED";
                        }
                    }
 
                 p=p->next;
                }//while
               }
             getch();
            }//2
         if(ch=="3")
            {
             cout<<"\n\nenter key(15char):";
             char name[16];
             gets(name);
             name[15]=NULL;
             int f=0;
 
             for(int i=0;i<=23;i++)
               {
                book *p=parts[i];
                while(p!=NULL)
                {
                 char *tokenptr;
                 tokenptr=strtok(p->explain," ");
                 while(tokenptr!=NULL)
                    {
                     if(strcmp(tokenptr,name)==0)
                        {
                         f++;
 
                         cout<<"\n"<<f<<":";
                         cout<<"name:";puts(p->book_name);
                         cout<<"aouthor:";puts(p->aouther);
                         cout<<"explain:";puts(p->explain);
                         if(p->reserved==1)
                             {
                              cout<<"RESERVED BY";
                              puts(p->user);
                             }
                         else
                             {
                              cout<<"NOT RESERVED";
                             }
                        }
                     tokenptr=strtok(NULL," ");
                    }
 
                 p=p->next;
                }//while
               }//for i
             getch();
            }//3
 
        }
 
    }
//===========================
//===========================
 int main()
    {
     clrscr();
 
     library l1;
     l1.run_menu();
 
     return(0);
    }

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
 
 
struct student{
    char name[20];
    char family[25];
    int id;
    student *next;
};
student *first,*last;
//////////////////////////
void input(){
student *temp=new student;
cout<<"plese enter the id : "<<endl;
cin>>temp->id;
cout<<"plese enter the name : "<<endl;
cin>>temp->name;
cout<<"plese enter the family : "<<endl;
cin>>temp->family;
if (first==NULL){
    first=last=temp;
}
else {
    temp->next=last;
    last=temp;
}
}
/////////////////////////////////
void output(){
student *temp=new student;
temp=first;
while(temp!=NULL){
    cout<<temp->id<<endl;
    cout<<temp->name<<endl;
    cout<<temp->family<<endl;
    cout<<"*************************************";
    temp=temp->next;
}
cout<<"end of record"<<endl;
}
/////////////////////////////////////
void search(int id){
student *temp=new student;
int find;
temp=first;
while(temp!=NULL){
    if (id==temp->id){
        cout<<temp->id<<endl;
        cout<<temp->name<<endl;
        cout<<temp->family<<endl;
        find=1;
        break;
        }
    else{
        find=0;
        temp=temp->next;
        }
}
    if (find==0){ cout<<"not find record"<<endl;}
}
////////////////////////////////////
void main(){
int stat;
for (;;){
system("cls");
cout<<"***************************************"<<e  ndl;
cout<<"num 1 for input data " <<endl;
cout<<"num 2  for list data " <<endl;
cout<<"num 3 for search data " <<endl;
cout<<"num 4 for exit" <<endl;
cout<<"***************************************"<<e  ndl ;
cin>>stat;
system("cls");
switch(stat){
    case 1:
        input();
        break;
    case 2:
        output();
        break;
    case 3:
        int key;
        cout<<"plese enter id for search : " ;
        cin>>key;
        search(key);
        break;
    case 4:
        exit(0);
}
}
}

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
 
//=====================================
//=====================================
struct address {
       char name[30] ;
       char street[30] ;
       char city[20] ;
       char state[3] ;
       char number[14] ;
       struct address *next ;
       struct address *prior ;
} list_entry ;
//=====================================
//=====================================
struct address *start ;
struct address *last ;
 
void enter() , display() , search() ;
void list() , del();
void display(struct address *info, int *row);
 
struct address *find(char *);
int menu_select();
struct address *store(struct address *, struct address *);
//=====================================
//=====================================
 
 
 
 
//****************
 
int menu_select()
{
      char s[5];
      system("cls");
      gotoxy(25,4) ;
      printf("1. enter a name ") ;
      gotoxy(25,6) ;
      printf("2. delete a name ") ;
      gotoxy(25, 8) ;
      printf("3. list all files ") ;
      gotoxy(25, 10) ;
      printf("4. search ") ;
      gotoxy(25, 12) ;
      printf("5. quit ") ;
      do {
      gotoxy(20, 18) ;
      printf("enter your select--power By majid (1-5):");
      gets(s);
      } while (atoi(s) < 0 || atoi(s) > 5) ;
      return atoi(s) ;
}
//*********************
 
 
void enter ()
{
   struct address *info ;
   int i ;
   char ch ;
   system("cls") ;
   gotoxy(3, 2) ;
   printf("   name        street     city     state    number");
   gotoxy(3, 3) ;
   printf(" ------------ -------- ");
   printf("--------   -----  ------- ");
   i = 4 ;
   for (;;) {
     info = (struct address *)malloc(sizeof(list_entry)) ;
     if(!info) {
    printf("\n out of memory. press a key ") ;
    getch();
    return ;
     }
     gotoxy(3, i) ;
     gets(info -> name) ;
     if (!info -> name[0]) {
      gotoxy(15, i + 1) ;
      printf("press a key to continue");
      getch() ;
      break ;
     }//end of if
     gotoxy(18, i);
     gets(info -> street) ;
     gotoxy(28, i) ;
     gets(info -> city) ;
     gotoxy(38, i) ;
     gets(info -> state) ;
     gotoxy(45, i) ;
     gets(info -> number) ;
     i++ ;
     start = store(info, start) ;
     } /* entry loop */
    }
//**************
 
 
struct address *store(struct address *i, struct address *top)
{
   struct address *old, *p ;
   if(last == NULL) {
    i -> next = NULL ;
    i -> prior = NULL ;
    start = i;
    last = i ;
    return i ;
   }
   p = top ;
   old = NULL ;
   while (p != NULL) {
       if(strcmp(p -> name, i -> name) < 0) {
          old = p ;
          p = p -> next ;
       }//end of if
       else {
         if (p -> prior) {
          p -> prior -> next=i ;
          i -> next=p ;
          i -> prior=p -> prior;
          p -> prior=i ;
          return top ;
         }//end of if
         i -> next = p ;
         i -> prior = NULL ;
         p -> prior = i ;
         return i ;
       }//end of if
   } // end of while
   old -> next = i ;
   i -> next = NULL ;
   i -> prior = old ;
   last = i ;
   return start ;
}
//******************
 
 
void del()
{
   struct address *info;
   char name[80];
   gotoxy(20, 20) ;
   printf(" enter name for delete : ") ;
   gets(name) ;
   info = find(name) ;
   if(info == NULL) {
       gotoxy(10, 20) ;
       printf(" name not found! press a key to continue.");
       getch() ;
   }
   if (info)
     if (start == info)
    {
      start = info -> next ;
      if(start)
         start -> prior = NULL ;
      else
         last = NULL ;
    } //end of if
     else  {
       info -> prior -> next = info -> next;
       if(info != last)
         info -> next -> prior = info -> prior;
       else
        last = info -> prior ;
     } //end of else
     free(info) ;
     gotoxy(10,20) ;
     printf("name deleted, press a key to continue.");
     getch() ;
}
//*******************************
 
 
struct address *find(char *name)
{
     struct address *info ;
     info = start ;
     while(info != NULL) {
    if (strcmp(name, info -> name) == 0)
       return info;
    info = info -> next ;
     }
     return NULL ;
}
//*****************
 
 
void list ()
{
    struct address *info ;
    int i ;
    info = start ;
    system("cls") ;
    gotoxy(3, 2) ;
    printf("   name        street     city     state    number");
    gotoxy(3, 3) ;
    printf(" ------------ --------  -");
    printf("-------   -----  ------- ");
    i = 4 ;
    while(info != NULL) {
    display(info, &i) ;
    info = info -> next ;
    }
    gotoxy(15, i + 2) ;
    printf("press a key to continue.");
    getch() ;
}
//*******************
 
 
void display(struct address *info, int *row)
{
      gotoxy(3, *row) ;
      printf("%s", info -> name) ;
      gotoxy(18, *row) ;
      printf("%s", info -> street) ;
      gotoxy(28, *row) ;
      printf("%s", info -> city) ;
      gotoxy(38, *row) ;
      printf(info -> state) ;
      gotoxy(47, *row) ;
      printf(info -> number) ;
      *row = *row + 1 ;
}
//**************************
 
 
void search()
{
     char name[40] ;
     int i ;
     struct address *info;
     gotoxy(20, 20) ;
     printf(" enter name to find : ");
     gets(name) ;
     info = find(name) ;
     if(info == NULL) {
      gotoxy(10, 20) ;
      printf(" name not found! press a key to continue.");
      getch() ;
     }//end of if
     else  {
          system("cls") ;
          gotoxy(3, 2) ;
          printf("   name        street   city     state   number");
          gotoxy(3, 3) ;
          printf(" ------------ -------");
          printf("-  --------   -----  ------- ") ;
          i = 4 ;
          display(info ,&i) ;
          gotoxy(15, i + 2) ;
          printf("press a key to continue.");
          getch() ;
     }//end of else
}
//*********************
 
int main()
{
       start = last = NULL ;
       for(;;) {
         switch(menu_select()) {
           case 1:  enter();  break ;
           case 2 : del();    break ;
            case 3:  list() ;  break ;
           case 4:  search(); break ;
           case 5:  exit(0) ;
 
        }//end of switch
       }//end of for
}//end of main