用for while 成绩的有效输入

#include "stdio.h"
void main()
{
   int score,s;
    printf("请输入你的成绩:");
    scanf("%d",&s);
    score=s;
    for(;score<||score>;)

        {
            printf("您输入有误,请重新输入:");
            scanf("%d",&score);
         }
    while(score<=&&score>=)
    {
        printf("你的成绩是：%d",score);
        score=score+;
    }
}