Calculating min/max from the terminal in C - c

Question

i want to create a program which prints biggest first number and biggest second number when i enter 5 number.(1.value of the number is=0) .there is no problem when i enter 5 numbers bigger than 0, but when i enter 5 numbers smaller than 0 , program prints first biggest number is 0 and second biggest number is 1.
#include <stdio.h>
int main() {
int number = 0, first, second, numbercounter = 0;
first = number;
while (numbercounter < 5) {
printf("5 tamsayi girin:", ++numbercounter);
scanf("%d", &number);
if (number > first) {
second = first;
first = number;
} else if (number > second)
second=number;
}
printf("En buyuk sayi: %d \n", first);
printf("En buyuk ikinci sayi:%d \n", second);
if (first % second == 0) {
printf("%d, %d'nin tam katidir.\n", first, second);
} else {
printf("%d, %d'nin tam kati degildir.\n", first, second);
}
if (first == second) {
printf("%d ve % esittir.\n", first, second);
} else {
printf("%d ve %d esit degildir.\n", first, second);
}
if (first % 2 != 0) {
printf("%d tektir.\n", first);
} else {
printf("%d cifttir.\n", first);
}
return 0;
}

Answer 1

There are two problems:
first starts out as 0. If number is negative, if (number > first) is false.
second is used uninitialised if number <= first.
Use INT_MIN for your initial values, this is the most negative integer you can have. Use this declaration
#include <stdio.h>
#include <limits.h>
int main()
{
int number = 0, first = INT_MIN, second = INT_MIN, numbercounter = 0;
Also get rid of the line
first = number;