C program to find century for a year

#include <stdio.h>
void find_century(int years)
{
    // No negative value is allow for years
    if (years <= 0)
    {
        printf("0 and negative is not allow for a years\n");
    }
    // If years is between 1 to 100 it
    // will come in 1st century
    else if (years <= 100)
    {
        printf("1st century\n");
    }
    else if (years % 100 == 0)
    {
        printf("%d%s",years/ 100, " century");
    }
    else
    {
        printf("%d%s",years/ 100 +1, " century");
    }
}
int main()
{
    int years;
    //Ask user to input number of years
    printf("Enter Years: ");
    scanf("%d", &years);
    find_century(years);
    return 0;
}

Output:

Enter Years: 2020
21 century