Reading data from text file and highlighting users selection?

I would be very greatful if someone could point me in the right direction. So far I have a program which reads in a series of currencies from a text file. When the user presses a key 1 to 9 a different currency is selected i.e. 1=British pound, 2=Euro. Depending upon the two numbers the rate is then calculated. I was wondering whether it is at all possible to highlight the users selection i.e. whenever they press 1 change the colour of the text British Pound, 2 Euro and so on. I presume it would go in either one of these functions but im not entirely sure. Any help though would be much appreciated.

void convert(void)
{
	gotoxy(20,17);
	printf("Select currency to convert from ");

	from=(getch()-48);
	while(from<1 || from>9)
		from=(getch()-48);
        gotoxy(20,17);
	printf("                                ");

	gotoxy(20,17);
	printf("Select currency to convert to ");

	to=(getch()-48);
	while(to<1 || to>9)
		to=(getch()-48);

	gotoxy(20,17);
	printf("                              ");
	gotoxy(20,17);
	printf("Enter amount: ");
	amount=gfloat();

	gotoxy(20,19);
	printf("%1.2f",(amount/rates[from-1])*rates[to-1]);
	//getch();
	//system("cls");             
	pause();
}

void read_file(float *rates)
{
	char buff[80];
	int i;
	
	i=0;
	while(fgets(buff,80,fpin)!=NULL)
	{  //      x   y
		gotoxy(17,7+i);
		printf("%d %s",i+1,buff);
		gotoxy(42,7+i);
		printf("%d %s",i+1,buff);
		if(fgets(buff,80,fpin)!=NULL)
		rates[i++]=(float)atof(buff);
	}
	fclose(fpin);
}