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First, I must say that I know very few things about programming a microcontroller in C, but I would like to learn.
The following program is not written by me, but I have to write a similiar one...

lit = getchar();

If I use this line, the program ends when it gets to it

Anyway, I've search the help for some hints( I hate doing the Help search, I'm surprised that it helped me this time),...

I've put %s because %c doesn't work... If I do make the change, it exits the program after it prints on the screen "b) Multiply"(at least, this happens on my machine).

#include <stdio.h>

main()
{
int a,b,c;
char lit;
printf("A number: ");
scanf("%d", &a);
printf("Another number: ");
scanf("%d",...