[問題] 終極密碼遊戲問題

[jacky1989 (幻想的夢境)]

#include<stdlib.h>
void main()
{
int i,r,d,u,l;
char c;
srand((unsigned)time(NULL));
do{
do{
printf("Enter upper (limit is 1 to 32767)\n");
        scanf("%d",&u);
        while(u<=0||u>=32768){
                printf("Error! Limit is 1 to 32767\n");
                printf("Enter upper (limit is 1 to 32767)\n");
                scanf("%d",&u);
                }

printf("Enter lower (limit is 1 to 32767)\n");
        scanf("%d",&l);
        while(l<=0||l>=32768){
                printf("Error! Limit is 1 to 32767\n");
                printf("Enter upper (limit is 1 to 32767)\n");
                scanf("%d",&l);
                }

}while(l>=u);
        i=rand()%(u-l)+1;
        while(i<=l){
                i=rand()%u+1;
                }
do{
printf("Please Enter Your Guess\n");
        scanf("%d",&d);
                if(i==d)
                        printf("You win\n");
                else if(d<=i)
                        printf("range is %d to %d\n",d,u);
                else if(d>=i)
                        printf("range is %d to %d\n",l,d);
}while(i!=d);
        printf("Again?(Y/N)\n");
        scanf("%d%d",&c,&c);

}while(c!='n');
}

這是我寫的程式
不過最後要按Y/N的時候卻怎樣都會變無窮迴圈
不知道怎辦
還有輸入的文字我想要判斷是否為數字
不過還是不行
有哪位高手可以幫助一下?

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推 zlw:scanf("%c",&c);
→ jacky1989:對不起喔~我蠢~因為%d打太習慣了，不過判斷數字還有問題