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C++ vector resize() function

❮ Vector Functions


Example

Change the size of a vector:

vector<string> cars = {"Volvo", "BMW", "Ford", "Mazda"};
cars.resize(2);
for(string car : cars) {
  cout << car << "\n";
}
Try it Yourself »

Definition and Usage

The resize() function changes the number of elements that are in the vector.

If the resized vector is larger then the value of newly added elements can be specified.

Syntax

One of the following:

vector.resize(size_t size);
vector.resize(size_t size, <type> value);

The size_t data type is a non-negative integer. <type> refers to the type of the data that the vector contains.

Parameter Values

Parameter Description
size Required. The new size of the vector.
value Options. The value assigned to newly added elements if the vector increases in size.

More Examples

Example

Resize a vector and add new elements to it:

vector<string> cars = {"Volvo", "BMW", "Ford", "Mazda"};
cars.resize(6, "Toyota");
for(string car : cars) {
  cout << car << "\n";
}
Try it Yourself »

Related Pages

Read more about vectors in our Vector Tutorial.


❮ Vector Functions

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