This C Program Updates the Details of Employee using Files.
Here is source code of the C Program to Update Details of Employee using Files. The C program is successfully compiled and run on a Linux system. The program output is also shown below.
/*
* C Program to Update Details of Employee using Files
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct emp
{
int empid;
char *name;
};
int count = 0;
void add_rec(char *a);
void display(char *a);
void update_rec(char *a);
void main(int argc, char *argv[])
{
int choice;
while (1)
{
printf("MENU:\n");
printf("1.Add a record\n");
printf("2.Display the file\n");
printf("3.Update the record\n");
printf("Enter your choice:");
scanf("%d", &choice);
switch(choice)
{
case 1:
add_rec(argv[1]);
break;
case 2:
display(argv[1]);
break;
case 3:
update_rec(argv[1]);
break;
case 4:
exit(0);
default:
printf("Wrong choice!!!\nEnter the correct choice\n");
}
}
}
void add_rec(char *a)
{
FILE *fp;
fp = fopen(a, "a+");
struct emp *temp = (struct emp *)malloc(sizeof(struct emp));
temp->name = (char *)malloc(50*sizeof(char));
if (fp == NULL)
printf("Error!!!");
else
{
printf("Enter the employee id\n");
scanf("%d", &temp->empid);
fwrite(&temp->empid, sizeof(int), 1, fp);
printf("enter the employee name\n");
scanf(" %[^\n]s", temp->name);
fwrite(temp->name, 50, 1, fp);
count++;
}
fclose(fp);
free(temp);
free(temp->name);
}
void display(char *a)
{
FILE *fp;
char ch;
int rec = count;
fp = fopen(a, "r");
struct emp *temp = (struct emp *)malloc(sizeof(struct emp));
temp->name = (char *)malloc(50*sizeof(char));
if (fp == NULL)
printf("Error!!");
else
{
while (rec)
{
fread(&temp->empid, sizeof(int), 1, fp);
printf("%d", temp->empid);
fread(temp->name, 50, 1, fp);
printf(" %s\n", temp->name);
rec--;
}
}
fclose(fp);
free(temp);
free(temp->name);
}
void update_rec(char *a)
{
FILE *fp;
char ch, name[5];
int rec, id, c;
fp = fopen(a, "r+");
struct emp *temp = (struct emp *)malloc(sizeof(struct emp));
temp->name = (char *)malloc(50*sizeof(char));
printf("Enter the employee id to update:\n");
scanf("%d", &id);
fseek(fp, 0, 0);
rec = count;
while (rec)
{
fread(&temp->empid, sizeof(int), 1, fp);
printf("%d", temp->empid);
if (id == temp->empid)
{
printf("Enter the employee name to be updated");
scanf(" %[^\n]s", name);
c = fwrite(name, 50, 1, fp);
break;
}
fread(temp->name, 50, 1, fp);
rec--;
}
if (c == 1)
printf("Record updated\n");
else
printf("Update not successful\n");
fclose(fp);
free(temp);
free(temp->name);
}
$ cc file5.c $ a.out empl MENU: 1.Add a record 2.Display the file 3.Update the record Enter your choice:1 Enter the employee id 1 enter the employee name aaa MENU: 1.Add a record 2.Display the file 3.Update the record Enter your choice:1 Enter the employee id 2 enter the employee name bbb MENU: 1.Add a record 2.Display the file 3.Update the record Enter your choice:3 Enter the employee id to update: 1 1Enter the employee name to be updated1bc Record updated MENU: 1.Add a record 2.Display the file 3.Update the record Enter your choice:2 1 1bc 2 bbb MENU: 1.Add a record 2.Display the file 3.Update the record Enter your choice:4
Sanfoundry Global Education & Learning Series – 1000 C Programs.
advertisement
advertisement
Here’s the list of Best Books in C Programming, Data-Structures and Algorithms
If you wish to look at programming examples on all topics, go to C Programming Examples.
Related Posts:
- Check C Books
- Apply for Computer Science Internship
- Check Computer Science Books
- Watch Advanced C Programming Videos
- Practice Computer Science MCQs