Re: (VU-Study-Corner) Re: 4 errors in code

delete following statement 

using namespace std;

then try.

On Tue, Nov 8, 2011 at 10:25 PM, *4rnd MIT* <mc110202419@vu.edu.pk> wrote:

aoa

navila this cod has 4 compile errors.

do you know how can we make a correct solution

On Tue, Nov 8, 2011 at 9:14 PM, mc100402220 Navila Akam <mc100402220@vu.edu.pk> wrote:

# include <iostream.h>

# include <stdlib.h>

using namespace std;

struct student

{

char student_name[30];

char ID_NO[20];

struct student* previous;

struct student* next;

};

void Menu();

void Show_List(struct student*);

struct student* Add_Student(char [], char [], struct student*);

struct student* Erase_Student(char [], struct student*);

int main(void)

{

char student_name[30];

char ID_NO[20];

struct student* first = NULL;

struct student* node0 = NULL;

int x = 0;

int opt;

Menu();

for(; 

{

cout<<"\n1- Enter student information:";

cout<<"\n2- Search Students by ID:";

cout<<"\n3- Search Students by name:";

cout<<"\n4- Delete Students information:";

cout<<"\n5- Print all students:";

cout<<"\n6- Quit:\n";

cin>>opt;

switch(opt)

{

case 1:

cout<<"\nStudent ID:";

cin>>ID_NO;

cout<<"\nStudent Name:";

cin>>student_name;

node0 = Add_Student(student_name, ID_NO , first);

first = node0;

break;

case 5:

Show_List(first); 

break;

default:

cout<<"\nRecord not found\n";

Menu();

break;

case 6:

return 0;

case 3:

cout<<"Enter the name:";

cin>>student_name;

Show_List(first);

case 2:

cout<<"Enter the ID:";

cin>>ID_NO;

Show_List(first); 

}

}

cin>>x;

}

void Menu()

{

}

void Show_List(struct student* firstNode)

{

struct student* firstNodeCopy = firstNode;

int number = 0;

if(firstNode == NULL)

cout<<"\nThe list is empty.\n";

cout<<"Students ID:"<<"\t\t Students Name";

cout<<"\n-------------"<<"\t\t --------------";

while(firstNodeCopy)

{

printf(" \t\t", ++number, firstNodeCopy->student_name,"\t");

printf("\n%s \t\t\t%s\n", firstNodeCopy->ID_NO);

firstNodeCopy = firstNodeCopy->next;

}

}

struct student* Add_Student(char name_1[], char ID[], struct student* firstNode)

{

struct student* start = firstNode;

struct student* last = NULL;

struct student* addNode = (struct student*) malloc(sizeof(struct student));

if(firstNode == NULL)

{

firstNode = (struct student*) malloc(sizeof(struct student));

strcpy(firstNode->student_name, name_1);

strcpy(firstNode->ID_NO, ID);

firstNode->next = NULL;

firstNode->previous = NULL;

return firstNode;

}

else

{

strcpy(addNode->student_name, name_1);

strcpy(addNode->ID_NO, ID);

while(start)

{

if(strcmp(addNode->student_name, start->student_name) > 0)

{

if(start->next == NULL)

{

start->next = addNode;

addNode->previous = start;

addNode->next = NULL;

return firstNode;

}

else

{

last = start;

start = start->next;

}

}

if(strcmp(addNode->student_name, start->student_name) < 0)

{

if(last == NULL)

{

addNode->next = start;

start->previous = addNode;

return addNode;

}

else

{

addNode->next = start;

addNode->previous = last;

last->next = addNode;

start->previous = addNode; 

return firstNode; 

}

}

if(strcmp(addNode->student_name, start->student_name) == 0)

{

addNode->next = start;

start->previous = addNode;

return addNode;

}

else

{

addNode->next = start;

addNode->previous = last;

last->next = addNode;

start->previous = addNode; 

return firstNode;

}

}

if(start->next == NULL)

{

start->next = addNode;

addNode->previous = start;

addNode->next = NULL;

return firstNode;

}

else

{

last = start;

start = start->next;

}

}

}

struct student* Erase_Student(char ID[], struct student* firstNode)

{

struct student* start = firstNode;

struct student* last = NULL;

if(start == NULL)

{

cout<<"\nThe list is empty.\n";

return NULL;

}

else

{

while(start)

{

if(strcmp(ID, start->ID_NO) == 0)

{

if(last == NULL)

{

start = start->next;

return start;

}

else

{

last->next = start->next;

return firstNode;

}

}

else

{

last = start;

start = start->next;

}

}

cout<<"\nYou entered a WRONG personal ID number to erase!!! Please try again.\n";

return firstNode;

}

}

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