7. Strings

Indexing and building strings

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Reading 1

Characters inside a string

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s[i] is the character at index i. Indexes start at 0 and go to s.size() - 1.

You can change a character with s[i] = 'X'; Join strings with + or +=.

Looping from 0 to size()-1 visits every character.

string s = "cat";
cout << s[0] << endl;  // c
s[0] = 'b';
cout << s << endl;     // bat
cout << s + "s" << endl;

Check 2

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For string s = "code"; which expression is the last character?

Fill in 3

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Try it 4

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Try other words.

main.cpp

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Program input (stdin)

Output will appear here.

Assignment 5

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Read one word (lowercase letters). Print how many vowels it contains (a e i o u).

main.cpp

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