More on Pointer & File Handling

 

C Language

More on Pointer & File Handling

Fill in the blanks

1.write a header file for Dynamic memory allocation <malloc.h>

2.malloc & calloc are same.[T/F].   False  

3.malloc means Memory allocation

4.Calloc means continuous  block of allocation

5.realloc means Reallocation of Memory

6.free() means Deallocate the Memory

7.Dynamic memory allocation used in linked list

8.static memory allocation used in Array

9.stdlib.h header file expansion standard library

10.Pointer to pointer points value

11.File syntax   FILE *ptr;

12.  r means read mode

13.  w means write mode

14. a+ means read,write ,append mode

15. rb, wb means read and write in binary mode

16. To create a file using function name  fopen()

17. In Read mode we can write a data.[T/F]. False

18.In Write mode we can print a data.[T/F]. False

19.ftell()  means Printing current position in file.

20.fseek() means moving previous position.

21.The primary advantage of using a data file is Permanent storage of data.

Answer the following Question

                                                                    (4 marks)

 

                                1.Write a Program to write a File.

#include<stdio.h>

#include<conio.h>

main()

{

    char name[40];

    int age,i;

    float bs;

    FILE *fp;

    clrscr();

    fp=fopen("employee.txt","w");

    if(fp==NULL)

    {

       printf("Cannot open file");

       exit();

    }

    for(i=0;i<5;i++)

    {

       printf("\n Enter Name , age , Salary\n");

       scanf("%s%d%f",&name,&age,&bs);

       fprintf(fp,"%s %d %f\n",name,age,bs);

    }

    fclose(fp);

}

                                2.Write a Program to Read a File.

#include<stdio.h>

#include<conio.h>

main()

{

   char name[40];

   int age,i;

   float bs;

   FILE *fp;

   clrscr();

   fp=fopen("employee.txt","r");

   if(fp==NULL)

   {

       printf("Cannot open file");

   }

 

 

       while(fscanf(fp,"%s %d %f",&name,&age,&bs)!=EOF)

       printf("%s %d %f\n",name,age,bs);

   fclose(fp);

   getch();

}