访问二维数组(整数和字符数组) [英] Accessing the 2-D array( integer and character array)

问题描述

请考虑以下代码:

char arr[3][10]={"white","red","blue"};
cout<<arr[2];  //output 1
int brr[3][3]={1,2,3,4,5,6,7,8,9};
cout<<brr[2];  //output 2

cout<<*brr[2];

输出1:白色，解引用后将w作为输出

Output 1 : white, on dereferencing it gives w as output

输出2:十六进制地址(0x28 .....)

Output 2 : hexadecimal address(0x28.....)

输出3:最后一行的第一个元素7

Output 3 : Last row first element 7

我很困惑为什么整数和字符数组的输出存在差异.

I am confused why there is difference in output in array of integers and characters.

推荐答案

提供指针时，它将使用

When you supply a pointer it will use the std::ostream& operator<<( const void* value ); overload and output the address pointed at by value.

区别在于 std :: ostream&运算符<<(std :: ostream& os，const char * s) 是一种特殊情况，它将取消引用 s 并输出 char \ 0 .只要不遇到 \ 0 ，它就会将 s 向前移动.

The difference is that std::ostream& operator<<(std::ostream& os, const char* s) is a special case and it will dereference s and output the chars until a \0 is encountered. As long as no \0 is encountered, it'll step s forward.

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