c++ - 改名查找？

Question

我有以下代码，编译器说“'i' 的名称查找已更改...”。设置-fpermissive，它可以通过编译器...

for (i=1;i<MAXINUMBER-1;i++)
{
    for (j=i;j>0;j--)
    {
        if (a[j]>a[j-1])
            {
                temp=a[j-1];
                a[j-1]=a[j]; a[j]=temp;
            }
        else
            break;
    }
}

但我不认为我已经改变了'i'......那么我错过了什么吗？非常感谢你们...

Answer 1

很简单，

//the int i declaration below is like it's within the {} block
for (int i = 0; i < 10; i++)
{
    //do something
}

//i is out of scope here, you can't use i any more, u must redeclare
//int i = 5; //ok!
//for (int i = 0; i < 20; i++) //ok!
for (i = 0; i < 20; i++) //no, you can't do this

两种方法解决你的问题，

一、把i声明放到外面

int i;
for (i = 0; i < 10; i++)

二、再次声明i

for (int i = 0; i < 10; i++)