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#include <stdio.h>
 
while (!kbhit()){
		  num_serial = print_serial();
		  if(!num_serial%8){
		  	if(!strcmp( "noise", command_char )){
		  		send_command( "N o i s e", -10);
		  	}
		  	else if(!strcmp( "Voltage", command_char )){
		  		send_command( "V", parameter);
		  	}
		  	else if(!strcmp("Poll", command_char)){
		  		send_command("Poll", 0);
		  	}
		}
	  }
	  fflush(stdin);
	  while (((ch=getch())!='\r') && (i < KEY_IN_BUFLEN - 1)) //press Enter to stop while loop

prog.c:3:1: error: expected identifier or '(' before 'while'
 while (!kbhit()){
 ^
prog.c:17:4: warning: data definition has no type or storage class
    fflush(stdin);
    ^
prog.c:17:4: warning: type defaults to 'int' in declaration of 'fflush' [-Wimplicit-int]
prog.c:17:4: warning: parameter names (without types) in function declaration
prog.c:18:4: error: expected identifier or '(' before 'while'
    while (((ch=getch())!='\r') && (i < KEY_IN_BUFLEN - 1)) //press Enter to stop while loop
    ^

Standard output is empty