THINK++ — Engineering Visualized

Toolbox

String Functions

The std::string class provides a rich set of member functions to manipulate and analyze text data.

length() / size()

Returns the number of characters in the string.

append(str) / +=

Adds text to the end of the string.

substr(pos, len)

Returns a part of the string starting at 'pos'.

find(str)

Returns the index of the first occurrence of 'str'.

clear()

Removes all characters from the string.

empty()

Checks if the string length is 0.

PRACTICAL EXAMPLE

string s = "C++ Programming";

if (s.find("Prog") != string::npos) {
    string sub = s.substr(4, 4); // "Prog"
    cout << sub.length();        // 4
}

string::npos is a constant returned by find() if the substring is not found.

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