Merge pull request Harshsngh07#64 from Mazurr/master

Add Simple phonebook menagment

Language/C++/phonebook management system.cpp

@@ -0,0 +1,309 @@
+# include <conio.h>
+# include <stdio.h>
+# include <alloc.h>
+# include <string.h>
+
+struct node
+{
+    int num;
+    char name[15];
+    struct node *next;
+};
+
+
+struct node *list; //global start pointer
+FILE *fp; // Global file pointer
+
+struct node *getrecord()
+{
+    struct node *temp,e;
+    temp=(struct node*)malloc(sizeof(struct node));
+
+    printf("Reached till here...");
+    getch();
+
+    fflush(stdin);
+// fscanf(fp,"%d %s",&temp->num,temp->name);
+    fread(&temp,sizeof(temp),1,fp);
+    printf("%d %s",temp->num,temp->name);
+
+// temp->num=e.num;
+// strcpy(temp->name,e.name);
+    getch();
+    temp->next = NULL;
+    return temp;
+}
+
+struct node *getnode()
+{
+    struct node *temp;
+    temp = (struct node*)malloc(sizeof(struct node));
+
+    printf("Enter the person's phone number--->");
+    scanf("%d",&temp->num);
+
+    printf("Enter the person's Name--->");
+    scanf("%s",&temp->name);
+
+    temp->next = NULL;
+    return temp;
+}
+
+struct node *search(int id,int *flag)
+{
+    struct node *cur,*prev;
+    *flag=0;
+
+    if
+    (list==NULL)
+        return NULL;
+
+    for(prev=NULL,cur=list; (cur); prev=cur,cur=cur->next)
+        if(cur->num == id)
+        {
+            *flag = 1;
+            break;
+        }
+
+
+    return prev;
+}
+
+int insert(struct node *new1)
+{
+    struct node *prev;
+    int flag;
+
+    prev = search(new1->num,&flag);
+
+    if(list==NULL)
+    {
+        list = new1; //first node in list
+        return;
+    }
+
+    if(flag==1)
+        return -1;
+    else
+    {
+        new1->next = prev->next;
+        prev->next = new1; // insert in the middle or end
+    }
+
+    return 0;
+}
+
+void display()
+{
+    struct node *cur;
+    auto int n=0;
+
+    if(list==NULL)
+    {
+        printf("List empty !");
+        return;
+    }
+
+    printf("The phone records are--->");
+    cur=list;
+    for(cur=list; (cur); cur=cur->next)
+    {
+        printf("Record no. %d--->",n+1);
+        printf("Record phone no.:%d",cur->num);
+        printf("person Name:%s",cur->name);
+        n++;
+    }
+
+}
+
+int delnode(int id)
+{
+    struct node *prev,*temp;
+    int flag=0;
+
+    if(list==NULL)
+        return -1;
+
+    prev=search(id,&flag);
+
+    if(flag==0)
+        return -1;
+
+    if(prev==NULL)
+    {
+        temp=list;
+        list=list->next;
+        free(temp);
+    }
+
+    else
+    {
+        temp=prev->next;
+        prev->next=temp->next;
+        free(temp);
+    }
+    return 0;
+}
+
+struct node *query(int id,char *flag,int toggle)
+{
+    struct node *cur,*prev;
+    int x=0;
+
+    if(list==NULL)
+        return NULL;
+
+    if(toggle)
+    {
+        for(prev=NULL,cur=list; (cur); prev=cur,cur=cur->next)
+            if(cur->num == id)
+            {
+                x=1;
+                break;
+            }
+    }
+    else
+    {
+        for(prev=NULL,cur=list; (cur); prev=cur,cur=cur->next)
+            if(!strcmp(cur->name,flag))
+            {
+                x=1;
+                break;
+            }
+    }
+
+    if(x==0)
+    {
+        printf("The number doesnt exist !");
+        return NULL;
+    }
+
+    return cur;
+}
+
+void CopyToFile()
+{
+    FILE *fp;
+    struct node *cur;
+    fp=fopen("phone.txt","w");
+
+    cur=list;
+    if(cur==NULL)
+    {
+        printf("The list is empty, nothing to write back...");
+        return;
+    }
+    for(cur=list; (cur); cur=cur->next)
+        fprintf(fp,"%d %s",cur->num,cur->name); //writing back to file
+    fclose(fp);
+}
+
+void main()
+{
+    int ch=0,ans=0;
+    int val=0;
+    char str[15];
+    struct node *new1,*new2;
+
+
+    clrscr();
+
+    /* initialization of list with the existing records */
+
+    fp=fopen("phone.txt","r");
+
+    if(fp==NULL)
+    {
+        printf("File cant be opened !");
+        getch();
+        exit(1);
+    }
+
+    while(!feof(fp))
+    {
+        new1=getrecord();
+
+        if(insert(new1)==-1)
+            printf("Cant insert record ! Error...");
+        else
+            printf("Record entered...");
+    }
+    getch();
+    fclose(fp);
+
+    do
+    {
+        clrscr();
+        printf("Menu");
+        printf("1. Add a New phone record.");
+        printf("2. Delete an existing Record.");
+        printf("3. show all Records.");
+        printf("4. Modify a particular Record.");
+        printf("5. Exit.");
+        printf("Enter your choice--->");
+        scanf("%d",&ch);
+
+        switch(ch)
+        {
+        case 1:
+
+            new1 = getnode();
+            val = insert(new1);
+            if(val==-1)
+                printf("Employee id already exists ! try again...");
+            else
+                printf("Employee details successfully stored");
+            break;
+
+        case 2:
+            printf("Enter the phone no.you wish to delete--->");
+            scanf("%d",&val);
+            ans=delnode(val);
+
+            if(ans==-1)
+                printf("Record doesnt exist ! Try again...");
+            if(ans==0)
+                printf("Record deleted !");
+            break;
+
+        case 3:
+            display();
+            break;
+
+        case 4:
+            printf("Search by phone no. or Name ? (1/2)--->");
+            scanf("%d",&ch);
+            if(ch==1)
+            {
+                printf("Enter the phone no. you wish to search for--->");
+                scanf("%d",&val);
+                new2=query(val,&str,1);
+            }
+            else
+            {
+                printf("Enter the name of the person you wish to search for--->");
+                scanf("%s",&str);
+                new2=query(val,&str,0);
+            }
+            if(new2)
+            {
+                printf("Enter the New name of the person--->");
+                scanf("%s",&new2->name);
+                printf("Enter new phone no. of the person--->");
+                scanf("%d",&new2->num);
+                printf("Record modified successfully !");
+            }
+            break;
+        case 5:
+            printf("Leaving Database,writing back to file...");
+            CopyToFile();
+            getch();
+            free(list);
+            exit(1);
+            break;
+        }
+        getch();
+    }
+    while(1);
+
+}