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Simplicity is the ultimate sophistication.” — Leonardo da Vinci
Contact me: sreramk360@gmail.com

Friday, 27 March 2015

employee record program



Program to manipulate and store employee records
 

/*
* problem 3
* employee record program
*/
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#define NILL 0
#define Set_NULL(employeeRec) (*((unsigned long long int*)&employeeRec) = NILL)
#define Check_If_Null(employeeRec) ( *((unsigned long long int*)&employeeRec) == NILL )
struct EMPLOYEE;
typedef struct EMPLOYEE Employee;

struct EMPLOYEE
{
    char name[50];
    float Salary;
    char designation[100];
    unsigned int empNo;
};

Employee getRecord()
{
    Employee emp;
    printf("\nenter the employee details: ");
    printf("\nenter name: "); fflush(stdin);
    gets(emp.name); fflush(stdin);
    printf("\nenter the salary of the employee: ");
    scanf("%f", &emp.Salary); fflush(stdin);
    printf("\nenter the designation of the employee: ");
    scanf("%s", emp.designation); fflush(stdin);
    printf("\nenter the employee number: ");
    scanf("%d", &emp.empNo);
    return emp;
}


void displayRecord(Employee emp)
{
    if (Check_If_Null(emp))
    {
        fprintf(stderr, "\nerror: record not found");
        return;
    }
    printf("\nname: %s", emp.name);
    printf("\nsalary: %f", emp.Salary);
    printf("\nemployee number: %d", emp.empNo);
    printf("\nemployee designation: %s", emp.designation);
}
int WriteRecordToFile(Employee emp, const char* F_name)
{
    FILE *f;
    f = fopen(F_name, "r+b");
    if (f == NULL)
    {
        f = fopen(F_name, "w+b");
        if (f == NULL)
        {
            fprintf(stderr, "error: unable to open the file %s", F_name);
            getch();
            return -1;
        }
    }
    fseek(f, 0, SEEK_END);
    fwrite(&emp, sizeof(emp), 1, f);
    fclose(f);
    return 0;
}

Employee FindRecord(const char* name, const char* F_name)
{
    Employee emp;
    FILE *f = fopen(F_name, "rb");
    if (f == NULL)
    {
        fprintf(stderr, "error: unable to open file");
        Set_NULL(emp);
        return emp;
    }
    while (!feof(f))
    {
        fread(&emp, sizeof(emp), 1, f);
        if (strcmp(name, emp.name) == NILL)
        {
            fclose(f);
            return emp;
        }
    }
    Set_NULL(emp);
    fclose(f);
    return emp;
}

void updateSalary(const char* Name, const char* F_Name, float salary)
{
    Employee emp;
    FILE *f = fopen(F_Name, "r+b");
    while (!feof(f))
    {
        fread(&emp, sizeof(emp), 1, f);
        if (strcmp(Name, emp.name) == NILL)
        {
            emp.Salary = salary;
            fseek(f, -((int)sizeof(emp)), SEEK_CUR);
            fwrite(&emp, sizeof(emp), 1, f);
            fclose(f);
            return;
        }
    }
    fclose(f);
}
void displayMenu()
{
    printf("\n1. add record");
    printf("\n2. find record by name");
    printf("\n3. modify salary");
    printf("\n4. exit ");
}
int main()
{
    Employee tempEmp; char ch = '\0';
    char name[50]; float Salary;
    while (ch != '4')
    {
        system("cls");
        displayMenu();
        ch = getch();
        switch (ch)
        {
        case '1':
            tempEmp = getRecord();
            WriteRecordToFile(tempEmp, "records.dat");
            break;
        case '2':
            printf("\nenter the name:");
            fflush(stdin);
            gets(name);
            tempEmp = FindRecord(name, "records.dat");
            displayRecord(tempEmp);
            getch();
            break;
        case '3':
            printf("\nenter the employee name: ");
            fflush(stdin);
            gets(name);
            tempEmp = FindRecord(name, "records.dat");
            if (Check_If_Null(tempEmp))
            {
                getch();
                continue;
            }
            printf("enter salary: ");
            fflush(stdin);
            scanf("%f", &Salary);
            updateSalary(name, "records.dat", Salary);
            break;
        case '4': break;
        default:
            fprintf(stderr, "error: invalid choice");
            getch();
        }
    }
    return 0;
}




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