Program to store roll,name and percentage of some students in a data file

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
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                                 
}while(choice!='n');        //writing repeats as you enter 'y'                             
printf("\n writing process completed successfully\n");
fclose(k);                            //closing of file                       
getch();
return 0;
}

//or
#include<stdio.h>
#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");                 //opening of file in write mode
printf("press ctrl+z to exit\n");//message to terminate the program
printf("first enter roll then percentage then name\n");
while((scanf("%d%f%s",&roll,&per,name))!=EOF)//inputs goes until the file ends(End of File)
{
fprintf(k,"%d %f %s\n",roll,per,name);   //writing data to data file
}
printf("\n writing process completed successfully\n");
fclose(k);                                       //closing data file
getch();
return 0;
}


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using turboc++
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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
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                                 
}while(choice!='n');        //writing repeats as you enter 'y'                             
printf("\n writing process completed successfully\n");
fclose(k);                            //closing of file                       
getch();
return 0;
}

//or
#include<stdio.h>
#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");                 //opening of file in write mode
printf("press ctrl+z to exit\n");//message to terminate the program
printf("first enter roll then percentage then name\n");
while((scanf("%d%f%s",&roll,&per,name))!=EOF)//inputs goes until the file ends(End of File)
{
fprintf(k,"%d %f %s\n",roll,per,name);   //writing data to data file
}
printf("\n writing process completed successfully\n");
fclose(k);                                       //closing data file
getch();
return 0;
}