file.cpp

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
typedef struct
{
	char name[100];
	int age;
	float sal;
	int id;
}emp;
void inputdata(emp *ep)
{
	printf("enter employee's name:");
	fflush(stdin);
	gets(ep->name);
	printf("enter employee's age:");
	scanf("%d",&ep->age);
	printf("enter employee's salary:");
	scanf("%f",&ep->sal);
	printf("enter employee's id:");
	scanf("%d",&ep->id);
}
void savedata(FILE *fp,emp *ep)
{
	fprintf(fp,"%s\n%d\n%7.2f\n%d\n",ep->name,ep->age,ep->sal,ep->id);
}
int readdata(FILE *fp,emp *ep)
{
	char temp[31];
	if(fgets(ep->name,99,fp)==NULL)
		return 0;
		
	ep->name[strlen(ep->name)-1]='\0';
	
	fgets(temp,30,fp);//replaces enter by null fgets//
	temp[strlen(temp)-1]='\0';
	ep->age=atoi(temp);
	fgets(temp,10,fp);
	temp[strlen(temp)-1]='\0';
	ep->sal=atof(temp);
	fgets(temp,10,fp);
	temp[strlen(temp)-1]='\0';
	ep->id=atoi(temp);
	return 1;														
}
void printdata(emp *e,int i)
{
	printf("%d# employee's name is %s\nage is %d\nsalary is %7.2f\nid is %d\n",i,e->name,e->age,e->sal,e->id);
}
void addrecord(FILE *fp)
{
	emp e;
	fp=fopen("c:\\users\\lenovo\\desktop\\emp.txt","a");
	inputdata(&e);
	savedata(fp,&e);
	fclose(fp);
}
void displayrecord(FILE *fp)
{
	int i=1;
	char temp[100];
	 emp e;
	fp=fopen("c:\\users\\lenovo\\desktop\\emp.txt","r");
	if(fp==NULL)
		puts("file not found");
	else
		puts("file found");	
	while(readdata(fp,&e))
	{
		
			printdata(&e,i);
			i++;
	}
	fclose(fp);
}
void searchbyid(FILE *fp)
{
	emp e;
	fp=fopen("c:\\users\\lenovo\\desktop\\emp.txt","r");
	int id,found=0,i=1;
	printf("enter the id you want to search:");
	scanf("%d",&id);
	while(readdata(fp,&e))
	{
		if(e.id==id)
		{
			printdata(&e,i);
			found=1;
			break;
		}
		i++;
	}
	if(!found)
		printf("id not found");
	fclose(fp);
}
void searchbyname(FILE *fp)
{
	emp e;
	fp=fopen("c:\\users\\lenovo\\desktop\\emp.txt","r");
	int found=0,i=1;
	char name[50];
	printf("enter the name you want to search:");
	fflush(stdin);
	gets(name);
	while(!feof(fp))
	{
		readdata(fp,&e);
		if(!strcmp(e.name,name))
		{
			printdata(&e,i);
			found=1;
			break;
		}
		i++;
	}
	if(!found)
		printf("name not found");
	fclose(fp);
}
void edit(FILE *fp)
{
	emp e;
	int id;int found=0;
	FILE *t;
	t=fopen("c:\\users\\lenovo\\desktop\\temp.txt","w");
	fp=fopen("c:\\users\\lenovo\\desktop\\emp.txt","r");
	printf("enter the id you want to edit:");
	scanf("%d",&id);
	while(readdata(fp,&e))
	{
		
		if(e.id==id)
		{
			found=1;
			inputdata(&e);
		}
		savedata(t,&e);
	}
	if(!found)
		printf("id not found");
		fclose(fp);
		fclose(t);
		unlink("c:\\users\\lenovo\\desktop\\emp.txt");
		rename("c:\\users\\lenovo\\desktop\\temp.txt","emp.txt");
}	


void deleterecord(FILE *fp)
{
	emp e;
	int id;int found=0;
	FILE *t;
	t=fopen("c:\\users\\lenovo\\desktop\\temp.txt","w");
	fp=fopen("c:\\users\\lenovo\\desktop\\emp.txt","r");
	printf("enter the id you want to delete:");
	scanf("%d",&id);
	while(readdata(fp,&e))
	{
		
		if(e.id==id)
			found=1;
		else	
			savedata(t,&e);
	}
	if(!found)
		printf("id not found");
	fclose(fp);
	fclose(t);
	unlink("c:\\users\\lenovo\\desktop\\emp.txt");
	rename("c:\\users\\lenovo\\desktop\\temp.txt","emp.txt");
}	

int main()
{
	int ch;
	FILE *fp;
	while(1)
	{
		printf("1.Add\n2.Display\n3.Search by id\n4.Search by name\n5.Edit\n6.Delete\n7.Exit\n");
		printf("enter choice:");
		scanf("%d",&ch);
		switch(ch)
		{
			case 1:addrecord(fp);
					break;
			case 2:displayrecord(fp);
					break;
			case 3:searchbyid(fp);
					break;
			case 4:searchbyname(fp);
					break;
			case 5:edit(fp);
			    	break;
			case 6:deleterecord(fp);
					break;
			case 7: exit(1);
		}	
	}
}