Help with declaring variables

**dgigga** · 03-07-2014

I am having some difficulties with my code. I am new to C Programming and I am receiving the following error.
error: ‘clrscr’ was not declared in this scope

Code:

#include <stdio.h>

 

int main(void) {

    int i,n,sum =0,l,s,list[100];

   float avg;

   clrscr();

   /* Reading the array value */

   printf("Total value in the array\n");

   scanf("%d",&n);

   printf("Enter %d value \n",n);

   for(i=0;i<n;i++)

      scanf("%d",&list[i]);

 

   s=l=sum= list[0]; /* Take first value of array and assign into sum,l,s*/

   /* Compare and sum */

   for(i=1;i<n;i++)

   {

      if(list[i]>l) l=list[i];

      if(list[i]<s) s=list[i];

      sum+=list[i];

   }

   /* Print result */

   avg=sum/(float)n;

   printf("Data list is:\n");

   for(i=0;i<n;i++)

       printf("%5d",list[i]);

   printf("\n\n");

   printf("Largest Value   = %d\n",l);

   printf("Smallest Value  = %d\n",s);

   printf("Sum of all data = %d\n",sum);

   printf("Average         = %f\n",avg);

   getch();

 

}

**grumpy** · 03-07-2014

clrscr() is a function.

It is also non-standard. If it is included in the library that comes with your compiler, it is typically in a header file named <conio.h>. If not, you're going to have to write some function to achieve the desired effect (of clearing the screen).

Similar comment goes for getch() (it gets character input from a console window).

Also, it is better to call "your code" what it is. What you've actually done is taken code (or been given code) from somewhere else and tweaked it. Because there is no way code YOU had written would make use of specific non-standard functions without you knowing what they are.

**c99tutorial** · 03-08-2014

By the way, this example doesn't seem to even call for the functionality implied by clrscr or getch. Just get rid of them and try the code as it stands without them. I personally don't like the terminal clearing everytime I launch a new command.

**C-learner** · 03-08-2014

yeah clrscr() is not a standard function and can be absent in your compiler implementation. But if you insist on using them
system("cls") can be put in place of clrscr() if your on windows, system("cls") goes with the headerfile stdlib.h(C header)/cstdlib(C++ header) or nothing depending on your compiler and getch() goeswith the header file conio.h. and where clrscr() is placed in your above coding is rubbish.

#include <stdlib.h> or #include <cstdlib>
for system("cls");

#include<conio.h>
for getch();

both function takes a semicolon at the end

**grumpy** · 03-08-2014

Originally Posted by C-learner

system("cls") can be put in place of clrscr() if your on windows, system("cls")

The behaviour of system() is also implementation defined (i.e. not guaranteed to do anything in particular). It is not actually hard to change the effect of system("cls") under windows, for example, externally to your program.

If it was solely a choice between using system("cls") and conio clrscr() to clear a screen, then I'd use the latter.

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