计算20140215

是&&,逻辑与运算
不是&,位与运算
楼主,结果是1没错
7和4都为真,所以最后结果为真,即1
答案为1。
详解:
!(a+b)+c-1 && b+c/2
等价于
(!(a+b)+c-1) && (b+c/2)
计算机内部计算步骤(可以查看汇编)
先算!(a+b)+c-1 ——>0+5-1——>4
测试上一步结果(结果为4),表达式为真。
再算b+c/2——>结果为6(注意4/2结果为2,因为都是整型,余数丢掉)
测试上一步结果(结果为6),表达式为真。
最后,将结果1赋给整个表达式,即最后的结果。
#include <iostream>
using namespace std;
int main()
{
 int a = 3,b = 4,c = 5;
 int result = !(a+b)+c-1 && b+c/2;
 int step1 = !(a+b)+c-1;
 int step2 = b+c/2;
 cout<<"The result is ";
 cout<<result<<endl;
 return 1;
}
#include <iostream>
using namespace std;
int main()
{
    int a = 3, b = 4, c = 5, x, y;
    cout << (a + b>c && b == c) << endl;
    cout << (a || b + c && b - c) << endl;
    cout << (!(a>b) && !c || 1) << endl;
    cout << (!(x = a) && (y = b) && 0) << endl;
    cout << (!(a + b) + c - 1 && b + c / 2) << endl;
    system("pause");
    return 0;
}
#include <iostream>
using namespace std;
int main()
{
    int a, b, c;
    cout << "please enter three integer numbers:";
    cin >> a >> b >> c;
    if (a<b)
    if (b<c)
        cout << "max=" << c;
    else
        cout << "max=" << b;
    else if (a<c)
        cout << "max=" << c;
    else
        cout << "max=" << a;
    cout << endl;
    system("pause");
    return 0;
}

 



posted @ 2014-02-15 15:32  yuanqi  阅读(218)  评论(0编辑  收藏  举报