C++ Game Programming: Learn game programming with C++ step by step very easy by moh am

Author:moh, am [moh, am]
Language: eng
Format: epub
Publisher: UNKNOWN
Published: 2022-01-17T16:00:00+00:00

Tip

Warning! The code that follows is pointless (pun intended). It just demonstrates using pointers.// Some regular int variables

int score = 0;

int hiScore = 10;

// Declare 2 pointers to hold the addresses of ints int* pIntPointer1;

int* pIntPointer2;

// Initialize pIntPointer1 to hold the address of score pIntPointer1 = &score;// Initialize pIntPointer2 to hold the address of hiScore pIntPointer2 = &hiScore;

// Add 10 to score directly score += 10;

// Score now equals 10

// Add 10 to score using pIntPointer1 *pIntPointer1 += 10;

// score now equals 20- A new high score

// Assign the new hi score to hiScore using only pointers *pIntPointer2 = *pIntPointer1;

// hiScore and score both equal 20

In the previous code, we declare two int variables, score and hiScore . We then initialize them with the values zero and ten respectively. We next declare two pointers to int . They are pIntPointer1 and pIntPointer2 . We initialize them in the same step as declaring them to hold the addresses of (point to) the variables score and hiScore respectively.

Next we add ten to score in the usual way, score += 10 . Then we see that by using the dereference operator on a pointer we can access the value stored at the address they point to. The following code actually changed the value stored by the variable pointed to by pIntPointer1 :

// Add 10 to score using pIntPointer1 *pIntPointer1 += 10;

// score now equals 20, A new high score

The last part of the previous code dereferences both of the pointers to assign the value pointed to by pIntPointer1 as the value pointed to by

pIntPointer2 : // Assign the new hi-score to hiScore with only pointers *pIntPointer2 = *pIntPointer1;

// hiScore and score both equal 20

Both score and hiScore are now equal to 20 .

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