C ++ array initialization Methods

The initialization method of the C ++ array is explained in detail. The data name is an array data structure. In the arrayTest function, str is an array name. Why is the result of sizeof pointer length? This is because:

(1) When the array name is used as a function parameter, In the function body, it loses its own meaning and is just a pointer;

(2) Unfortunately, it also loses its constant feature while losing its connotation. It can perform auto-increment, auto-subtraction, and other operations and can be modified.

 

First look at array Initialization

# Include <iostream>
Using std: cout;
Using std: endl;

# Include <iomanip>
Using std: setw;

Int main ()
{
Int n [10];

For (int I = 0; I <10; I ++)
N [I] = 0;

For (int j = 0; j <10; j ++)
Cout <n [j] <endl;

Return 0;
}

Output result

0
0
0
0
0
0
0
0
0
0

Initialize an array

# Include <iostream>
Using std: cout;
Using std: endl;

# Include <iomanip>
Using std: setw;

Int main ()
{
Int n [10] = {2, 7, 4, 8, 5, 4, 9, 7, 6, 3 };

For (int I = 0; I <10; I ++)
Cout <n [I] <endl;

Return 0;
}

Static array will be initialized to 0

# Include <iostream>
Using std: cout;
Using std: endl;

Void staticArrayInit (void );
Void automaticArrayInit (void );

Int main ()
{
StaticArrayInit ();
AutomaticArrayInit ();

StaticArrayInit ();
AutomaticArrayInit ();
Return 0;
}

Void staticArrayInit (void)
{
Static int array1 [3];

For (int I = 0; I <3; I ++)
Cout <"array1 [" <I <"] =" <array1 [I] <"";

For (int j = 0; j <3; j ++)
Array1 [j] = 0;
}

Void automaticArrayInit (void)
{
Int array2 [3] = {1, 2, 3 };

For (int I = 0; I <3; I ++)
Cout <"array2 [" <I <"] =" <array2 [I] <"";

For (int j = 0; j <3; j ++)
Array2 [j] = 0;
}
 

Result

Array1 [0] = 0 array1 [1] = 0 array1 [2] = 0 array2 [0] = 1 array2 [1] = 2 array
2 [2] = 3 array1 [0] = 0 array1 [1] = 0 array1 [2] = 0 array2 [0] = 1 array2 [1]
= 2 array2 [2] = 3