6
create a binary file and insert the records and query on those inserted record..
queries are: query based on search by name,search by age and search by designation.
the problem is i have created a binary file but it is not storing records permanently. i am using binary file for the first time. plz help me to know how to store records permanently . sending my code
#include<stdio.h>
#include<conio.h>
#include<string.h>
struct record
{
char name[50];
int age;
char designation[50];
}record ;
void main()
{
char name1[50], ch;
// char name[50];
char designation[50];
int age1,a,age2;
struct record r[1];
FILE *f;
int i,n,j;
clrscr();
f=fopen("c:\\input.dat","wb");
if(!f)
{
printf("unable to open binary file for reading \n");
return;
}
// fread(&r,sizeof(r),1,f);
fwrite(&r[a],sizeof(r[a]),1,f);
printf("Enter the option:\n 1.data entry:\n 2.query:\n");
scanf("%d",&i);
switch(i)
{
case 1:
{
printf("Enter number of records\n");
scanf("%d",&n);
// printf("enter the name\n");
// fgets(name,50,stdin);
for(a=1;a <=n; a++)
{
printf("Enter name\n");
scanf("%s",r[a].name);
// fgetc(r[a].name);
//gets(r[a].name,50,f);
printf("Enter age\n");
scanf("%d",&r[a].age);
//fgets(r[a].age,1,stdin)
printf("Enter designation\n");
scanf("%s",r[a].designation);
// gets(r[a].designation,50,f);
// fprintf(f,"%s %d %s\n", r[a].name,r[a].age,r[a].designation);
}
// fwrite(&r[a],sizeof(r[a]),1,f);
// break;
}
case 2:
{
printf("Enter the option:\n a.search by name:\n b.search by age:\n c.search by designation:\n");
scanf("%s",&ch);
switch(ch)
{
case 'a':
{
printf("\n Enter name\n");
scanf("%s",name1);
printf("Name\t\t Age\t\t Designation\t\t\n");
printf("--------------------------------------------\n");
for(i=0;i<=n;i++)
{
// if(strcmp(name1,r[i].name)==0)
// {
// for(j=0;j<=n;j++)
// {
if(strncmp(r[i].name,name1,strlen(name1))==0)
{
printf("%s\t\t %d\t\t %s\n", r[i].name,r[i].age,r[i].designation);
}
}
printf("--------------------------------------------\n");
break;
}
case 'b':
{
printf("\n Enter age1\n");
scanf("%d",&age1);
printf("Enter age2\n");
scanf(" %d",&age2);
printf("Name\t\t Age\t\t Designation\t\t\n");
printf("--------------------------------------------\n");
for(a=0;a<=n;a++)
{
if(r[a].age>=age1 && r[a].age<=age2)
{
printf("%s\t\t%d\t\t%s\n",r[a].name,r[a].age,r[a].designation);
}
// else
// printf("The name is not in the list of records\n");
}
printf("--------------------------------------------\n");
break;
}
case 'c':
{
printf("\n Enter designation\n");
scanf("%s",designation);
printf("Name\t\t Age\t\t Designation\t\t\n");
printf("--------------------------------------------\n");
for(i=0;i<=n;i++)
{
if(strncmp(r[i].designation,designation,strlen(designation))==0)
{
printf("%s\t\t %d\t\t%s\n",r[i].name,r[i].age,r[i].designation);
}
}
printf("--------------------------------------------\n");
break;
}
}
// default: printf("invalid choice\n");
// break;
}
}
getch();
}
