When i entered 555 as input.... Why do 5 came out as output?

Question

include <stdio.h>

int main() {
char a = getchar();

printf("You entered: %c", a);

return 0;
}

Answer 1

'getchar' only gets one char.

So basically, only your first entered char lands in a.

If you want to read in more, you need a char array (a place for several chars in a row), and another function that reads more than one char.

char a[10];
scanf("%s", a); // s for string
printf("You entered: %s", a);