![#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define size 200
struct emp
{
int id;
char *name;
}*emp1, *emp3;
void display();
void create();
void update();
FILE *fp, *fp1;
int count = 0;
void main(int argc, char **argv)
{
int i, n, ch;
printf("1] Create a Record ");
printf("2] Display Records ");
printf("3] Update Records ");](https://image.slidesharecdn.com/writeataskthatwillperformsomeofthefunctionsperformedbyas-220914220232-545bf20f/85/Write-a-task-that-will-perform-some-of-the-functions-performed-by-a-s-docx-2-320.jpg)
![printf("4] Exit");
while (1)
{
printf(" Enter your choice : ");
scanf("%d", &ch);
switch (ch)
{
case 1:
fp = fopen(argv[1], "a");
create();
break;
case 2:
fp1 = fopen(argv[1],"rb");
display();
break;
case 3:
fp1 = fopen(argv[1], "r+");
update();
break;
case 4:
exit(0);
}
}
}](https://image.slidesharecdn.com/writeataskthatwillperformsomeofthefunctionsperformedbyas-220914220232-545bf20f/85/Write-a-task-that-will-perform-some-of-the-functions-performed-by-a-s-docx-3-320.jpg)
![/* To create an employee record */
void create()
{
int i;
char *p;
emp1 = (struct emp *)malloc(sizeof(struct emp));
emp1->name = (char *)malloc((size)*(sizeof(char)));
printf("Enter name of employee : ");
scanf(" %[^ ]s", emp1->name);
printf("Enter emp id : ");
scanf(" %d", &emp1->id);
fwrite(&emp1->id, sizeof(emp1->id), 1, fp);
fwrite(emp1->name, size, 1, fp);
count++; // count to number of entries of records
fclose(fp);
}
/* Display the records in the file */
void display()
{
emp3=(struct emp *)malloc(1*sizeof(struct emp));
emp3->name=(char *)malloc(size*sizeof(char));
int i = 1;](https://image.slidesharecdn.com/writeataskthatwillperformsomeofthefunctionsperformedbyas-220914220232-545bf20f/85/Write-a-task-that-will-perform-some-of-the-functions-performed-by-a-s-docx-4-320.jpg)
![if (fp1 == NULL)
printf(" File not opened for reading");
while (i <= count)
{
fread(&emp3->id, sizeof(emp3->id), 1, fp1);
fread(emp3->name, size, 1, fp1);
printf(" %d %s",emp3->id,emp3->name);
i++;
}
fclose(fp1);
free(emp3->name);
free(emp3);
}
void update()
{
int id, flag = 0, i = 1;
char s[size];
if (fp1 == NULL)
{
printf("File cant be opened");
return;
}
printf("Enter employee id to update : ");](https://image.slidesharecdn.com/writeataskthatwillperformsomeofthefunctionsperformedbyas-220914220232-545bf20f/85/Write-a-task-that-will-perform-some-of-the-functions-performed-by-a-s-docx-5-320.jpg)
![scanf("%d", &id);
emp3 = (struct emp *)malloc(1*sizeof(struct emp));
emp3->name=(char *)malloc(size*sizeof(char));
while(i<=count)
{
fread(&emp3->id, sizeof(emp3->id), 1, fp1);
fread(emp3->name,size,1,fp1);
if (id == emp3->id)
{
printf("Enter new name of emplyee to update : ");
scanf(" %[^ ]s", s);
fseek(fp1, -204L, SEEK_CUR);
fwrite(&emp3->id, sizeof(emp3->id), 1, fp1);
fwrite(s, size, 1, fp1);
flag = 1;
break;
}
i++;
}
if (flag != 1)
{
printf("No employee record found");
flag = 0;
}
fclose(fp1);](https://image.slidesharecdn.com/writeataskthatwillperformsomeofthefunctionsperformedbyas-220914220232-545bf20f/85/Write-a-task-that-will-perform-some-of-the-functions-performed-by-a-s-docx-6-320.jpg)
Write a task that will perform some of the functions performed by a s.docx
- 1. Write a task that will perform some of the functions performed by a simple employee database. The various functions will be laid out below Data: Each record will consist of six attributes, one if with is the primary key. The primary key will be automatically assigned to a record when the record is created. The fields for the record are as follows: ID: integer (automatically generated by program) Last name: 20 character max First Name: 20 character max Social Security Number: 11 character max (include ") Salary: float Age: integer The data should be stored in a randomly accessible file. There should be at least 20 records stored in the file Index: The index function will be able to index the data on any given field in ascending or descending order. The Index function should prompt the user to enter the field to be indexed. In addition, they should indicate if they want to index in ascending or descending order. To complete this task the sorting should be done using merge sort, heap sort or quick sort. Also, when you are indexing, you should not move entire records The whole record should not be read in the program. Only the primary key and the indexed field should be stored in the program's memory Query: Extra Credit The query function will allow the user to perform basic queries by typing in SQL statements. This function should support the following SQL statements: . Select from table (basically it displays all records) . Select * from table where Solution /* * C Program to Create Employee Record and Update it */
- 2. #include <stdio.h> #include <stdlib.h> #include <string.h> #define size 200 struct emp { int id; char *name; }*emp1, *emp3; void display(); void create(); void update(); FILE *fp, *fp1; int count = 0; void main(int argc, char **argv) { int i, n, ch; printf("1] Create a Record "); printf("2] Display Records "); printf("3] Update Records ");
- 3. printf("4] Exit"); while (1) { printf(" Enter your choice : "); scanf("%d", &ch); switch (ch) { case 1: fp = fopen(argv[1], "a"); create(); break; case 2: fp1 = fopen(argv[1],"rb"); display(); break; case 3: fp1 = fopen(argv[1], "r+"); update(); break; case 4: exit(0); } } }
- 4. /* To create an employee record */ void create() { int i; char *p; emp1 = (struct emp *)malloc(sizeof(struct emp)); emp1->name = (char *)malloc((size)*(sizeof(char))); printf("Enter name of employee : "); scanf(" %[^ ]s", emp1->name); printf("Enter emp id : "); scanf(" %d", &emp1->id); fwrite(&emp1->id, sizeof(emp1->id), 1, fp); fwrite(emp1->name, size, 1, fp); count++; // count to number of entries of records fclose(fp); } /* Display the records in the file */ void display() { emp3=(struct emp *)malloc(1*sizeof(struct emp)); emp3->name=(char *)malloc(size*sizeof(char)); int i = 1;
- 5. if (fp1 == NULL) printf(" File not opened for reading"); while (i <= count) { fread(&emp3->id, sizeof(emp3->id), 1, fp1); fread(emp3->name, size, 1, fp1); printf(" %d %s",emp3->id,emp3->name); i++; } fclose(fp1); free(emp3->name); free(emp3); } void update() { int id, flag = 0, i = 1; char s[size]; if (fp1 == NULL) { printf("File cant be opened"); return; } printf("Enter employee id to update : ");
- 6. scanf("%d", &id); emp3 = (struct emp *)malloc(1*sizeof(struct emp)); emp3->name=(char *)malloc(size*sizeof(char)); while(i<=count) { fread(&emp3->id, sizeof(emp3->id), 1, fp1); fread(emp3->name,size,1,fp1); if (id == emp3->id) { printf("Enter new name of emplyee to update : "); scanf(" %[^ ]s", s); fseek(fp1, -204L, SEEK_CUR); fwrite(&emp3->id, sizeof(emp3->id), 1, fp1); fwrite(s, size, 1, fp1); flag = 1; break; } i++; } if (flag != 1) { printf("No employee record found"); flag = 0; } fclose(fp1);
- 7. free(emp3->name); /* to free allocated memory */ free(emp3); }