Customer information management system - C language

Simulate the implementation of a text-based interface 《 Customer information management software 》

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

// Define the structure data type 
struct Customer{
	int id; // Number 
	int age;
	char name[10];
	char gender;// Gender  w  Woman  m male 
	char phone[16];// Phone number 
	char email[20];// mailbox 
}; 

int loop=1;// Controls whether to exit the main menu 
char key;
int customerNum = 0;// Indicates the current number of customers  
char choice=' ';

// Customer structure array 
struct Customer customer[100];// At most 100 individual , Over expandable 
 

// Display information about a customer variable   Structure pointer  
 void getCustomerInfo(struct Customer *customer){
 	
 	printf("\n%d\t%s\t%c\t%d\t%s\t%s",(*customer).id,(*customer).name,(*customer).gender,(*customer).age,(*customer).phone,(*customer).email);
 	
 } 
 void add(){
 	customer[customerNum].id=customerNum+1;
 	printf("------------------ Add customers ------------------"); 
 	printf("\n Please enter a name ：");
	scanf("%s",customer[customerNum].name);
	getchar();
	
	printf("\n Please enter gender ：");
	scanf("%c",&(customer[customerNum].gender));
	getchar();
	
	printf("\n Please enter age ：");
	scanf("%d",&(customer[customerNum].age));
	getchar();
	
	printf("\n Please input the phone number ：");
	scanf("%s",customer[customerNum].phone);
	getchar();
	
	printf("\n Please enter email address ：");
	scanf("%s",customer[customerNum].email);
	getchar();
	printf(" The addition is complete ！"); 
	customerNum++;

 }
 
 int findId(int id){
     int index =-1;
 	for(int i=0;i<customerNum;i++){
 	if(customer[i].id==id){
 		index = i;
        }
	 }
 	return index;	
 } 
 
int del(int id){
 	int i;
 	int index = findId(id);
 	if(index==-1){ // Indicates that there is no id This customer  
 		return 0;// Can't delete  
	 }else{
 	for(i=index+1;i<customerNum;i++){
 		customer[i-1]=customer[i];
	 }
	 customerNum--;
	 return 1; // Delete successful  
	 }
 }
 // Display the interface for deleting users . And then call 
 void delView(){
 	int id=0;
 	char choice=' ';
 	printf("\n-------------- Delete customer ---------------");
 	printf("\n Please select the number to be deleted （-1 sign out ）：");
 	scanf("%d",&id);
 	getchar();
 	if(id==-1){
 		printf("\n-------- You gave up deleting ---------");
 		return;
	 }
	 printf("\n Confirm whether to delete (Y/N):");
	 scanf("%c",&choice); 
	 getchar();
	 if(choice=='Y'){
	   if(del(id)==0){
	   		printf("\n-------- Delete failed ,id non-existent ---------");
	   } else{
	   		printf("\n-------- Delete successful ---------");
	   } 
	 }
 } 

 
 
 // Display a list of customer information 
 void listCustomer(){
 	int i = 0;
	printf("\n------------------ Customer list ------------------");
	printf("\n Number \t full name \t Gender \t Age \t Telephone \t mailbox ");
	for(i=0;i<customerNum;i++){
		getCustomerInfo(&customer[i]);	
	} 
		printf("\n--------------------------------------------");
 } 
 
 int revise(int id){
 	int i;
 	char *str; 
 	int index = findId(id);
 	if(index==-1){ // Indicates that there is no id This customer  
 	
 		return 0;// Do not modify  
	 }else{
 	    printf("\n The list of user information displayed is as follows ") ; 
 		listCustomer();
 		printf("\n Please enter the name of the option you want to modify ：");
		scanf("%s",str); 
		if(strcmp(str," name ")==0){
			printf("\n Please enter the name you want to change ：");
			scanf("%s",customer[index].name);
			getchar();
		}else if(strcmp(str," Age ")==0){
			printf("\n Please enter the age you want to modify ：");
			scanf("%d",&(customer[index].age));
			getchar();
		}else if(strcmp(str," Gender ")==0){
			printf("\n Please enter the gender you want to change ：");
			scanf("%s",&(customer[index].gender));
			getchar();
		}else if(strcmp(str," Telephone ")==0){
			printf("\n Please enter the phone number you want to modify ：");
			scanf("%s",customer[index].phone);
			getchar();
		}else {
			printf("\n Please enter the email you want to modify ：");
			scanf("%s",customer[index].email);
			getchar();
		}
	 }
	 return 1; // Delete successful  
}
 void reviseView(){
 	int id=0;
 	char choice=' ';
 	printf("\n-------------- Modify customer ---------------");
 	printf("\n Please select the number to be modified （-1 sign out ）：");
 	scanf("%d",&id);
 	getchar();
 	if(id==-1){
 		printf("\n-------- You abandoned the modification ---------");
 		return;
	 }
	 printf("\n Confirm whether to modify (Y/N):");
	 scanf("%c",&choice); 
	 getchar();
	 if(choice=='Y'){
	   if(revise(id)==0){
	   		printf("\n No customer information ！ Please add before modifying ！");
	   		printf("\n-------------------------------------");
	   } else{
	   		printf("\n-------- Modification successful ---------");
	   		listCustomer(); 
	   } 
	 }
 }

 // Show main menu 
 void mainMenu(){
 	do{
 		printf("\n------------- Customer information management software ---------------"); 
 		printf("\n             1  Add customers  "); 
 		printf("\n             2  Modify customer  "); 
		printf("\n             3  Delete customer  "); 
 		printf("\n             4  Customer list  "); 
 		printf("\n             5   refund    Out   "); 
 		printf("\n--------------------------------------------");
 		printf("\n Please select （1-5）： "); 
 		scanf("%c",&key);
 		getchar();
 		
 		switch(key){
 			case'1':
 				add();
 				break;
 			case'2':
 		     	reviseView(); 
 				break;
 			case'3':
 				delView(); 
 				break;
 			case'4':
 				listCustomer();
 				break;
 			case'5':
 				do{
				 printf("\n Confirm whether to delete (Y/N):");
				 scanf("%c",&choice);
				 getchar();	
				
 			}while(choice!='Y'&&choice!='N');
 			if(choice='Y'){
 			loop=0;	
			 }
 			 break;
 			default:
 				printf("\n Your input is wrong , Please re-enter （1-5）：");
				break;		  
		 }	
	 }while(loop);
	 printf(" You have exited the customer management system ！");
	 getchar(); 
 } 
 
 int main(){
 	mainMenu(); // Call function , Show menu 
	
 }