Electronic address book management system based on C

be based on C Electronic address book management system

The purpose and requirements of the experiment ：

1. Further familiarity C The data type of the language 、 Operator 、 expression 、 Program control structure .
2. master C Language array and dynamic linked list skilled use .
3. master C The use of language pointers .4. master C The use of language structures .
5. master C Use of language file operation commands .
6. Through the comprehensive practice of the above knowledge, complete the coding of the electronic address book management system .

Program

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 100struct record
{
    
// Keep your name  
char name[20];
// Save email  
char email[30];
// Keep your home address  
char homeaddr[60];
// Save your phone number  
char telephone[13];			
}records[N];	// Array of structs 
int i; 
void Read_Data() /* Reading documents */
{
    // explain fp Is a pointer , Used for pointing FILE Object of type  
FILE*fp;								
fp=fopen("D:\\yinzhihui.txt","a+");
/*fopen The function is to open a file , File pointer name =fopen（ file name , Use file mode ）*/	i=0;	
	while(!feof(fp))//feof: End of file , Return non 0 value , File not closed , return 0 value  
	{
    	
	fscanf(fp,"%s%s%s%s",records[i].name,records[i].email,records[i].homead dr,records[i].telephone);		
	i++;
	}	
	fclose(fp);// If the stream closes successfully ,fclose  return  0, Otherwise return to EOF（-1）
}  
// Add a Contact 
void Add_People(char name[20])						
{
    	
	int j,n;	
	for(j=0;j<=i;j++)	// Sort the added contacts by name 
	{
     		
		if(strcmp(records[j].name,name)>0)
		break;//strcmp: Two strings are compared character by character from left to right （ Press ASCII value ）, Until a different character appears or '\0' until  
	}	
	for(n=i;n>=j;n--)	// Will be the first i The first message becomes the second i+1 individual  
	{
    			
		strcpy(records[n+1].name,records[n].name);/*trcpy Copy the last string to the previous array */		
		strcpy(records[n+1].email,records[n].email);        				strcpy(records[n+1].homeaddr,records[n].homeaddr);				strcpy(records[n+1].telephone,records[n].telephone);	
	}		
	i++;		
	strcpy(records[j].name,name);  // Save the contact name to the structure 
	printf("\n Please enter the email of the contact :");	    
	scanf("%s",records[j].email);		
	printf("\n Please enter the contact's home address :");	   
	scanf("%s",records[j].homeaddr);		
	printf("\n Please enter the contact's phone number :");	    
	scanf("%s",records[j].telephone);		
	printf("\n Add success !\n");
} 
int Search_Name(char namestr[20])   // Inquire about 
{
    	
	int j;	
	for(j=0;j<=i;j++)	
	{
    
		if(strcmp(namestr,records[j].name )==0)
		break;
	}		// It's different , Same output  
	return j;
}
void DeletePeo()			// Delete 
{
    	
	char nametemp[20];	
	int tp,n;	
	if(i<1)	
	{
    
		printf("\n No records deleted \n");
		return;
	}	
	printf(" Please enter the name of the contact you are looking for ：");	
	scanf("%s",nametemp);	
	n=Search_Name(nametemp);	
	if(n>i)	
	{
    
		printf(" To find the failure ！\n");
		return;
	}	
	printf(" Are you sure you want to delete ？ Confirm press 1, Otherwise, press any key to return to the previous menu ！\n");	
	scanf("%d",&tp);	
	if(tp==1)	// Confirm the input 1, Delete  
	{
    		
		int j;	
		for(j=n+1;j<=i;j++)
		{
    		
			strcpy(records[j-1].name,records[j].name);						strcpy(records[j-1].email,records[j].email);					strcpy(records[j-1].homeaddr,records[j].homeaddr);	
			strcpy(records[j-1].telephone,records[j].telephone);	
		}	
		i--;	
	}	
	else return;
}  
void Data_Show(int n)		// Show 
{
    
	printf("%s %s %s %s\n",records[n].name,records[n].email,records[n].homeaddr,records[n].telephone);
}
 void Change(char name[20])	// modify 
 {
    	
	int n,m;	
	char string[60];	
	n=Search_Name(name);// Judge whether the modified contact exists  
	if(n>i)	
	{
    
		printf(" The contact you are looking for does not exist ！\n");
		return;
	}	
	Data_Show(n);	// Show contact information  
	printf(" Please select the data you want to modify ：\n1 Modify contact name ;\n2 Modify contact email ;\n3 Modify contact address ;\n4 Modify contact phone number ;\n5 sign out ！;\n\n");	
	scanf("%d",&m);	
	while(m!=5)	
	{
    	
		switch(m)		
		{
    		
			case 1:printf(" Please enter a new name ：");
			 	scanf("%s",string);			
			 	strcpy(records[n].name ,string);
			 	break;	
			 case 2:printf(" Please enter a new email ：");	
			 		scanf("%s",string);											strcpy(records[n].email ,string);
			 		break;	
			case 3:printf(" Please enter a new address ：");
			 	scanf("%s",string);	
			 	 strcpy(records[n].homeaddr  ,string);
			 	 break;	
			case 4:printf(" Please enter a new phone number ：");
			 	scanf("%s",string);		
			 	strcpy(records[n].telephone  ,string);
			 	break;	
			case 5:return; 		
		}		
		printf(" Please continue to select the data you want to modify ：\n1 Modify contact name ;\n2 Modify contact email ;\n3 Modify contact address ;\n4 Modify contact phone number ;\n5 sign out ！;\n\n");	
		scanf("%d",&m);	
	}
}  
void Data_Save()// preservation 
{
    	
	FILE*fp;int n;fp=fopen("D:\\yinzhihui.txt","w+");       // Save information to a file yinzhihui.txt in 
	for(n=0;n<=i;n++)
	{
    	
		fprintf(fp,"%s %s %s %s",records[n].name,records[n].email,records[n].homeaddr,records[n].telephone);
		fprintf(fp,"\n");
	}
	fclose(fp);
}   
 void main()
{
    
	int ch,m,n;	
	char tp,nametemp[20];	
	Read_Data();   // Import the file data into the file yinzhihui.txt in  
	i--;	
	printf(" Electronic address book ：\n");	
	printf(" Please select the operation you need ：\n");	
	printf("1 modify ;\n2 View all contacts ;\n3 Delete Contact ;\n4 Query contact ;\n5 Add a Contact ;\n6 preservation ;\n7 sign out \n\n");	
	scanf("%d",&ch);	
	while(ch!=7)	
	{
    		
		switch(ch)		
		{
    		
			case 1:printf(" Please enter the contact name to modify ：");		
				scanf("%s",nametemp);			
				Change(nametemp);
				break;		
			case 2:for(m=0;m<=i;m++)Data_Show(m);
				break;		
			case 3:DeletePeo();
				break;		
			case 4:printf(" Please enter the name of the person you want to query ：");		
				scanf("%s",nametemp);			
				n=Search_Name(nametemp);			
				if(n>i) printf(" There is no contact name you are looking for ：");	
				else Data_Show(n);
				break;		
			case 5:printf(" Please enter the name of the contact to be added ：");	
				scanf("%s",nametemp);			
				Add_People(nametemp);break;		
			case 6:printf(" Save data ？ OK press 8 key , Otherwise, press any key to select another operation ！\n");			
				scanf("%d",&tp);			
				if(tp==8) Data_Save();
				break;		
			case 7:return;		
		}		
		printf("\n1 modify ;\n 2 View all contacts ;\n 3 Delete Contact ;\n 4 Query contact ;\n 5 Add a Contact ;\n6 preservation ;\n 7 sign out \n\n");		
		scanf("%d",&ch);	
	}
}  

result