7. Strings

Useful string operations

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Reading 1

Pieces and searches

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s.substr(pos, len) returns a piece of the string starting at pos.

s.find(target) returns the index where target starts, or string::npos if it is missing.

cin >> word stops at whitespace. getline(cin, line) reads a whole line including spaces — useful for sentences.

string s = "HelloWorld";
cout << s.substr(0, 5) << endl;  // Hello

if (s.find("World") != string::npos) {
    cout << "found" << endl;
}

Check 2

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If find does not locate the text, it returns

Fill in 3

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Try it 4

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Change the start and length.

main.cpp

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Program input (stdin)

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Assignment 5

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Read one word. If it contains the substring cpp (lowercase), print yes. Otherwise print no.

main.cpp

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