使用2个变量，一个存储最小值，一个存储最大值。

int min, max;

然后，指定变数：

if (num1 < num2)
    min = num1;
if (num3 < min)
    min = num3;
printf("%d is the largest number", min);

要知道一个数是奇数还是偶数，它除以2的余数（也称为模）将是0（偶数）或1（奇数）：

int modulo = min % 2;
if (modulo == 0)
    printf("%d is even", min);
else
    printf("%d is odd", min);

/*Write a program to find the largest and smallest among three entered numbers and
also display whether the identified largest/smallest number is even or odd*/
#include <stdio.h>
#include <conio.h>
void main()
{
    // start the programme
    int a, b, c, large, small;
    printf("Enter three numbers : \n");
    scanf("%d%d%d", &a, &b, &c);
    if (a > b && a > c)
    {
        printf("\n%d is largest", a);
        large = a;
    }
    else if (b > c)
    {
        printf("\n%d is largest", b);
        large = b;
    }
    else
    {
        printf("\n%d is largest", c);
        large = c;
    }
    if (a < b && a < c)
    {
        printf("\n%d is smallest", a);
        small = a;
    }
    else if (b < c)
    {
        printf("\n%d is smallest", b);
        small = b;
    }
    else
    {
        printf("\n%d is smallest", c);
        small = b;
    }
    if (large % 2 == 0)
    {
        printf("\n %d is even", large);
    }
    else
    {
        printf("\n %d is odd", large);
    }
    if (small % 2 == 0)
    {
        printf("\n %d is even", small);
    }
    else
    {
        printf("\n %d is odd", small);
    }
    getch();
    // end the programme
}