Simple Student Contact Information System

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <conio.h> #include <ctype.h> #include <iostream> #include <time.h> #include <windows.h> #include <dos.h> HANDLE wHnd; HANDLE rHnd; typedef struct contact { int number; char firstName[15]; char lastName[15]; char id[7]; char age[3]; char gender; char field; char phoneNumber[20]; char address[100]; struct contact *next; int count; } contact; FILE *datafile; contact *firstc, *currentc, *newc; int cnum = 0; void showOwnerInfo(){ puts("_______________________________________________"); puts("| |"); puts("| Simple Student Contact Information System |"); puts("| |"); puts("|_____________________________________________|\n"); } void correct_contact_number(){ currentc = firstc; int i=1; while(1){ if(currentc){ currentc->number=i; currentc = currentc->next; //cnum++; i++; }else{ break; } } } void show(struct contact *currentc){ printf("--FIRST-NAME--:\t%s\n", currentc->firstName); printf("---LASTNAME---:\t%s\n", currentc->lastName); printf("------ID------:\t%.7s\n", currentc->id); printf("------AGE-----:\t%s\n", currentc->age); printf("----GENDER----:\t"); switch (currentc->gender) { case '0': puts("male"); break; case '1': puts("female"); break; default: puts("-"); break; } printf("-----FIELD----:\t"); switch (currentc->field) { case '1': puts("ComputerEngineering"); break; case '2': puts("ComputerScience"); break; case '3': puts("ElectricalEngineering"); break; case '4': puts("MechanicalEngineering"); break; case '5': puts("ChemicalEngineering"); break; case '6': puts("AeroSpaceEngineering"); break; default: puts("???"); break; } printf("-PHONE-NUMBER-:\t%.11s\n", currentc->phoneNumber); printf("----ADDRESS---:\t%s\n", currentc->address); puts(""); } void find_cnum(){ currentc = firstc; while(1){ if(currentc){ currentc = currentc->next; cnum++; }else{ break; } } } void display_all_contacts(void){ system("cls"); showOwnerInfo(); puts("-----------------------------------"); puts("-------DISPLAY ALL CONTACTS--------"); if(firstc==NULL){ puts("-----------------------------------"); puts("___________________________________"); puts("| |"); puts("| NO CONTACTS TO DISPLAY! |"); puts("|_________________________________|"); }else{ int num = 1; currentc=firstc; do{ printf("----------------[%d]----------------\n\n",num++); show (currentc); } while((currentc=currentc->next) != NULL); } puts("press any key to continue:)"); getch(); } void display_all_contacts_with_numbers(void){//display all of the contacts + number if(firstc==NULL){ puts("___________________________________"); puts("| |"); puts("| NO CONTACTS TO DISPLAY! |"); puts("|_________________________________|"); }else{ int num=1; currentc=firstc; do{ printf("----------------[%d]----------------\n",num); show (currentc); num++; }while((currentc=currentc->next) != NULL); } } int go_to_contact_number_x (int x){//used in "changed" function (going to the next node X times!)(EXTRA!!!) currentc = firstc; for(int i = 0; i<x-1; i++){ if(currentc){ //previousa = currentc; currentc = currentc->next; }else{ return -1;//your contacts ar less than X! } } return 1; } void add_contact(void) {//add a contact ***not useable in final version*** system("cls"); showOwnerInfo(); int boool =1,isDigit=0;//to check if the input is correct or not newc = (struct contact *)malloc(sizeof(struct contact)); //allocate memory for our new structure(CONTACT!!!) if (firstc == NULL) //if this contact is our 1st contact... firstc = currentc = newc; else { currentc = firstc;// make the first record the current one while (currentc->next != NULL)// pass the previous contacts currentc = currentc->next; currentc->next = newc; //pointer to next node currentc = newc; //make current record the new one } //update the structure!! cnum++; puts("-----------------------------------"); puts("-------ADD A CONTACT TO LIST-------"); currentc->number = cnum; //I used "cnum" to give each contact a unique number puts("-----------------------------------"); printf("Enter your contact's 1st name : \n"); getchar(); gets(currentc->firstName); system("cls"); showOwnerInfo(); puts("-----------------------------------"); puts("-------ADD A CONTACT TO LIST-------"); puts("-----------------------------------"); printf("Enter %s's last name : \n",currentc->firstName); gets(currentc->lastName); system("cls"); showOwnerInfo(); puts("-----------------------------------"); puts("-------ADD A CONTACT TO LIST-------"); puts("-----------------------------------"); printf("Enter %s's student-ID : \n",currentc->firstName); while(boool){ scanf("%s", currentc->id); int j=0; isDigit = 0; while(currentc->id[j]!='\0'){ if(!isdigit(currentc->id[j])){ isDigit=1; puts("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); puts("!! !!"); puts("!! WRONG INPUT...TRY AGAIN !!"); puts("!! !!"); puts("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); printf("Enter %s's student-ID :\n(only NUMBERs are supported!!!) \n",currentc->firstName); break; } j++; } if(isDigit) continue; boool=0; } boool=1; system("cls"); showOwnerInfo(); puts("-----------------------------------"); puts("-------ADD A CONTACT TO LIST-------"); puts("-----------------------------------"); printf("How old is %s? \n",currentc->firstName); while(boool){ scanf("%s", currentc->age); int j=0; isDigit = 0; while(currentc->age[j]!='\0'){ if(!isdigit(currentc->age[j])){ isDigit=1; puts("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); puts("!! !!"); puts("!! WRONG INPUT...TRY AGAIN !!"); puts("!! !!"); puts("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); printf("Enter %s's age :\n(age is a NUMBER!!!) \n",currentc->firstName); break; } j++; } if(isDigit) continue; boool=0; } boool=1; system("cls"); showOwnerInfo(); puts("-----------------------------------"); puts("-------ADD A CONTACT TO LIST-------"); puts("-----------------------------------"); printf("Enter your contact's gender\n( 0 = male , 1 = female) : \n"); while(boool){ scanf( " %c",&(currentc->gender)); if(currentc->gender != '0' && currentc->gender != '1'){ puts("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); puts("!! !!"); puts("!! WRONG INPUT...TRY AGAIN !!"); puts("!! !!"); puts("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); puts("( 0 = male , 1 = female) : "); continue; } boool=0; } boool=1; system("cls"); showOwnerInfo(); puts("-----------------------------------"); puts("-------ADD A CONTACT TO LIST-------"); puts("-----------------------------------"); printf("Enter %s's field : \n",currentc->firstName); printf("( 1 =\t Computer Engineering\n"); printf(" 2 =\t Computer Science\n"); printf(" 3 =\t Electrical Engineering\n");