C++ String reserve() function

by Online Tutorials Library July 22, 2022

C++ String reserve()

This function requests a change in capacity.

Syntax

Consider a string str and l is planned length of the string. Its syntax would be:

Parameter

l is the planned length for the string

Note: capacity of the string can be greater than or equal to ‘l’.

Return value

It does not return any value.

Example

Let’s see the simple example.

  #include<iostream>  using namespace std;  int main()  {  string s=”Computer Science Technology”;  cout<<?Capacity is :?<<s.capacity()<<‘n’;              s.reserve(33);              cout<<?Now,capacity is :?<<s.capacity();  return 0;  }  

Output:

Capacity is 27  Now,capacity is : 54

In this example, we observe that how capacity of the string varies using reserve() function.

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