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Array initialization declaration c++

Initialize an array in c++

int nums[100] = {0}; // initiallize all values to 0

int nums[5] = {1,2,3,4,5};

// type name[size] = {values};

Source: dummies.com

How to initialize array with new in c++

int* a = NULL;   // Pointer to int, initialize to nothing.
int n;           // Size needed for array
cin >> n;        // Read in the size
a = new int[n];  // Allocate n ints and save ptr in a.
for (int i=0; i<n; i++) {
    a[i] = 0;    // Initialize all elements to zero.
}
. . .  // Use a as a normal array
delete [] a;  // When done, free memory pointed to by a.
a = NULL;     // Clear a to prevent using invalid memory reference.

Source: fredosaurus.com

Array initialization declaration c++

//Arrays only declaration
int tab[3][4];
//Arrays declaration with initialization
int tab[3][4] = {
  {0,1,2,3},
  {4,5,6,7},
  {8,9,10,11}   
};

Source: geeksforgeeks.org

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