vs2013中逻辑运算符怎么用？为什么我这样写不对呢？

Question

#include "stdafx.h"

#include

int _tmain(int argc, _TCHAR* argv[])
{
int grade;

scanf_s("%d", &grade);
if ( (90 <= grade) AND (grade <= 100))
    printf("A");
else if (80 <= grade && grade < 90)
    printf("B");
else if (70 <= grade && grade< 80)
    printf("C");
else if (60 <= grade && grade < 70)
    printf("D");
else
    printf("不及格");


system("pause");
return 0;

}

Answer 1

给你个提示吧，与运算符是&&，在你判断的时候看看运算符的优先级