执行 while 循环以请求正输入且小于 10

Question

I'm new to C and I was asked to make a loop that asks a user to input a number and then check if that number is positive and less than 10. However, I don't know what's wrong with the code below. Any help is much appreciated.

int main(){
int a;

do{
    printf("Enter a positive number: ");
    scanf("%i", &a);
}while((a <= 0) && (a >= 10));

    printf("%i is positive and less than 10", a);

return 0;
}

Answer 1

There are two problems that need fixing:

• You're not checking that scanf() succeeds. I/O is brittle and can fail.
• The condition is wrong, both branches of the && cannot be true at the same time, thus "and" is the wrong operator. You meant || (boolean "or").