Program to store and read roll,name and percentage of some students to /from a data file using same program.

using codeblocks
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//to store roll,name and percentage of some students
#include<stdio.h>       //header file
#include<conio.h>
int main()
{
FILE *k;                                                                    //  pointer for file declaration
char name[30],choice;                                                    //identifier declaration
int roll;                                                              //       "             "
float per;
k=fopen("student.txt","w");//file opening
printf("we are going to write /store data\n");
do
{
printf("\nenter roll\n");   //data input
scanf("%d",&roll);
printf("enter percentage\n");
scanf("%f",&per);
printf("enter  name\n");           // getting inputs
scanf("%s",name);
fprintf(k,"%d %f %s\n",roll,per,name); //writing data to data file
printf("want to continue (y/n)\n");//prints message
choice=getche();                      //gets a character                                  //getting a character from user
}while(choice!='n');        //writing repeats as you enter 'y'                                    // validating the input
printf("\n writing process completed successfully\n");
fclose(k);                            //closing of file                                                            //closing data file
printf("-----------------------------------------------\n");
printf("read records are:\n");
k=fopen("student.txt","r");//file opening

while((fscanf(k,"%d %f %s",&roll,&per,name))!=EOF)//inputs goes until the file ends(End of File)
{
printf("roll=%d per=%f name=%s\n",roll,per,name);   //printing on screen
}
printf("\n reading process completed successfully\n");
fclose(k);                                                           //closing data file

getch();
return 0;
}