How to check which key is pressed in keyboard using c program ???

void main()
{
char ch;
clrscr();
printf("Enter any character");
scanf("%c",&ch);

if(ch>=65 && ch<=90)
printf("%c Upper case alphabet pressed", ch);
else if(ch>=97 && ch<=122)
printf("%c Small case alphabet pressed", ch);
else if(ch>=48 && ch<=57)
printf("%c digit pressed",ch);
else
printf("%c  symbol pressed ", ch);
getch();
}

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