C输入输出的一个例子（不受Enter键影响）

    int guess = 1;             char yn;printf("enter a number:");printf("Uh....is %d?\n",guess);while((yn= getchar()) != 'y'){if( isalpha(yn)){printf("well,then ,is it %d?\n",++guess);}else{printf("input error\n");if(yn == '\n')continue;}    while(getchar() != '\n')   continue;                   //跳过输入行剩余的部分}printf("I knew I could do it !\n");