* array note some issues
*/
#include < iostream>
using namespace std;
Int main()
{
const int ArraySize = 5;
// initializes the elements in the array, and the uninitialized elements are by default filled with the value 0, representing the NULL character (NULL or \0)
int arr[ArraySize] = {10,3,5};
// array name, which represents the starting address of the first element (direct array name is recommended)
cout < < “arr = ” < < arr < < endl;
// array is a collection, take the address of the array name, get is the first address of the collection represented by the array (generally not recommended to use the address of the array name)
cout < < “& arr = ” < < & arr < < endl;
{
/* array name itself is not a variable, so it does not occupy storage space, nor can it be used to store data; ,
, which simply represents a data, as a value, it represents the address of the first data element in the array. */
// for example, the following is wrong!!
/* compile times wrong: assigning to an array from the an, initializer list */
// arr = {10,16,8};
// therefore, arrays cannot be assigned, only array elements can be initialized or assigned.
}
// if an array is defined and not initialized, its output will be garbage instead of having no value
/*cout < < “No array initialization, garbage data output!” < < endl;
for(int I = 0; i ! = ArraySize; I++)
cout & lt; < arr[i] < < “‘;
cout & lt; < endl;
// input data, assign values to data elements in arr array
/* even if the number of input data elements is greater than the length of the array, cin will only extract required data from the input buffer according to the length of the array
, while the remaining data will be left in the input buffer for use next time */
//cout < < “The input data are:”;
//for(int I = 0; i ! = ArraySize; I++)
// cin & gt; > arr[i];
// below are three different ways to output the address of each array element in memory
/*cout < < “Method 1:” < < endl;
for(int I = 0; i ! = ArraySize; I++)
cout & lt; < “& arr[” << i << “] = ” < < & arr[i] < < endl;
cout & lt; < “Method two:” < < endl;
for(int I = 0; i ! = ArraySize; I++)
cout & lt; < “[arr+” << i << “] = ” < < arr+i < < endl;
cout & lt; < “Method 3:” < < endl;
for(int I = 0,*p = arr; p ! = (arr+ArraySize) & & i ! = ArraySize; I++ p++)
cout & lt; < “p -[” << i << “]= ” < < p < < endl; */
/* the following four methods of outputting elements in an array have no errors;
the compiler changes the brackets in the array at compile time :(both sides are equivalent to each other)
arr[I] < => * (arr + I)
* (arr + I) & lt; => * (I + arr)
* (I + arr) & lt; => I (arr)
arr [I] < => I [arr]
I is the offset, indicating the number of elements of the offset first element */
/*for(int I = 0; i ! = ArraySize; I++)
cout & lt; < arr[i] < < “‘;
cout & lt; < endl;
For (int I = 0; i ! = ArraySize; I++)
cout & lt; < *(arr+i) < < “‘;
cout & lt; < endl;
For (int I = 0; i ! = ArraySize; I++)
cout & lt; < i[arr] < < “‘;
cout & lt; < endl;
for(int* p = arr; p ! = (arr+ArraySize); P++)
cout & lt; < *p < < “‘;
cout & lt; < endl; * /
cout <
cout < < “The consequences of a cross-border visit!” < < endl;
int iNum = 123,iLen = 90;
int array[7] = {10,3,6,8,5,9,7};
for(int I = -2);
for(int I = -2);
for(int I = -2); i ! = 9; I++)
cout & lt; < array[i] < < “‘;
cout & lt; < endl;
cout & lt; < iNum < < “—” < < iLen < < endl;
// Out-of-bounds storage of data can result in the value of other variables, and may even cause the program to crash (which didn’t happen, which is weird!!).
for(int I = -2; i ! = 7. I++)
cin & gt; > array[i];
for(int I = 0; i ! = 7. I++)
cout & lt; < array[i] < < “‘;
cout & lt; < endl;
cout & lt; < iNum < < “—” < < iLen < < endl;
return 0;
}
