130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/*
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* C Program to Update Details of Employee using Files
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct emp
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{
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int empid;
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char *name;
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};
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int count = 0;
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void add_rec(char *a);
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void display(char *a);
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void update_rec(char *a);
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void main(int argc, char *argv[])
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{
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int choice;
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while (1)
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{
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printf("MENU:\n");
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printf("1.Add a record\n");
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printf("2.Display the file\n");
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printf("3.Update the record\n");
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printf("Enter your choice:");
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scanf("%d", &choice);
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switch(choice)
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{
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case 1:
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add_rec(argv[1]);
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break;
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case 2:
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display(argv[1]);
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break;
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case 3:
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update_rec(argv[1]);
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break;
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case 4:
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exit(0);
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default:
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printf("Wrong choice!!!\nEnter the correct choice\n");
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}
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}
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}
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void add_rec(char *a)
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{
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FILE *fp;
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fp = fopen(a, "a+");
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struct emp *temp = (struct emp *)malloc(sizeof(struct emp));
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temp->name = (char *)malloc(50*sizeof(char));
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if (fp == NULL)
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printf("Error!!!");
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else
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{
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printf("Enter the employee id\n");
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scanf("%d", &temp->empid);
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fwrite(&temp->empid, sizeof(int), 1, fp);
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printf("enter the employee name\n");
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scanf(" %[^\n]s", temp->name);
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fwrite(temp->name, 50, 1, fp);
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count++;
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}
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fclose(fp);
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free(temp);
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free(temp->name);
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}
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void display(char *a)
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{
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FILE *fp;
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char ch;
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int rec = count;
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fp = fopen(a, "r");
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struct emp *temp = (struct emp *)malloc(sizeof(struct emp));
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temp->name = (char *)malloc(50*sizeof(char));
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if (fp == NULL)
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printf("Error!!");
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else
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{
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while (rec)
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{
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fread(&temp->empid, sizeof(int), 1, fp);
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printf("%d", temp->empid);
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fread(temp->name, 50, 1, fp);
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printf(" %s\n", temp->name);
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rec--;
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}
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}
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fclose(fp);
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free(temp);
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free(temp->name);
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}
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void update_rec(char *a)
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{
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FILE *fp;
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char ch, name[5];
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int rec, id, c;
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fp = fopen(a, "r+");
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struct emp *temp = (struct emp *)malloc(sizeof(struct emp));
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temp->name = (char *)malloc(50*sizeof(char));
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printf("Enter the employee id to update:\n");
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scanf("%d", &id);
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fseek(fp, 0, 0);
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rec = count;
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while (rec)
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{
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fread(&temp->empid, sizeof(int), 1, fp);
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printf("%d", temp->empid);
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if (id == temp->empid)
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{
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printf("Enter the employee name to be updated");
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scanf(" %[^\n]s", name);
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c = fwrite(name, 50, 1, fp);
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break;
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}
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fread(temp->name, 50, 1, fp);
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rec--;
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}
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if (c == 1)
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printf("Record updated\n");
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else
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printf("Update not successful\n");
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fclose(fp);
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free(temp);
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free(temp->name);
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} |