without pressing ENTER key: is it possible?

hi guys!

if i have an output of choices like this :
************************output**********************

[1]menu
[2]exit

****************************************************

do
{
if(ans==1)
{
//codes in menu
}
else if(ans==2)
{
printf("thank you. good bye");
exit(0);
}
else
printf("wrong input!");
)while(ans==1);

i really want to go to menu by just pressing the number 1(one) without pressing the ENTER key. but i cant do it..
:((
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