变量值如何获取的最大最小值

新手求教，以下程序变量min,max如何实现获得最大最小值，所有输入值看着程序上并未比较啊！
#include<stdio.h>
int main(void)
{
    const float MIN=0.0f;
    const float MAX=100.0f;

    float score;
    float total=0.0f;
    int n=0;
    float min=MAX;
    float max=MIN;

    printf("Enter the first score (q to quit):");
    while(scanf("%f",&score)==1)
    {
        if(score<MIN||score>MAX)
        {
            printf("%0.1f is an invaild value. Try again: ",score);
            continue;
        }
        printf("Accept %0.1f:\n",score);
        min=(score<min)?score:min;
        max=(score>max)?score:max;
        total+=score;
        n++;
        printf("Enter next score (q to quit):");
    }
    if(n>0)
    {
        printf("Average of %d score is %0.1f.\n",n,total/n);
        printf("Low=%0.1f,High=%0.1f\n",min,max);
    }
    else
    printf("No valid scores were entered.\n");

    system("pause");
    return 0;