Developing Algorithms Using Strings

AP Computer Science A· difficulty 3/5

public static int countChar(String s, char c) {
    int n = 0;
    for (int i = 0; i < s.length(); i++) {
        if (/* missing */) n++;
    }
    return n;
}

Which condition replaces /* missing */?

A
$s.equals(c)$
B
$s == c$
C
$s.charAt(c) == i$
D
$s.charAt(i) == c$
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Explanation

charAt(i) returns the i-th char; compare it to c with == since both are char primitives.

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