How to initialize all elements in an array to the same number in C++

Question

I\'m trying to initialize an int array with everything set at -1.

I tried the following, but it doesn\'t work. It only sets the first value at -1.

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Answer 1

Just use the fill_n() method.

Example

int n;
cin>>n;
int arr[n];
int value = 9;
fill_n(arr, n, value); // 9 9 9 9 9...

Learn More about fill_n()

or

you can use the fill() method.

Example

int n;
cin>>n;
int arr[n];
int value = 9;
fill(arr, arr+n, value); // 9 9 9 9 9...

Learn More about fill() method.

Note: Both these methods are available in algorithm library (#include). Don't forget to include it.