Return inside loops in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the first even number from the array.

C++

int firstEven(int arr[], int size) {
    for (int i = 0; i < size; i++) {
        if (arr[i] % 2 == 0) {
            return [1];
        }
    }
    return -1;
}

Drag options to blanks, or click blank then click option'

Aarr[i]

Bi

C0

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the index i instead of the element arr[i].

Returning size or 0 which are unrelated.

We return the actual even number found, which is arr[i].

2fill in blank

medium

Complete the code to return true if any number in the array is negative.

C++

bool hasNegative(int arr[], int size) {
    for (int i = 0; i < size; i++) {
        if (arr[i] < 0) {
            return [1];
        }
    }
    return false;
}

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Afalse

Btrue

Carr[i]

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Returning false inside the loop when a negative is found.

Returning the element arr[i] instead of a boolean.

Return true immediately when a negative number is found.

3fill in blank

hard

Fix the error in the code to return the index of the first zero in the array, or -1 if none.

C++

int findZero(int arr[], int size) {
    for (int i = 0; i < size; i++) {
        if (arr[i] == 0) {
            return [1];
        }
    }
    return -1;
}

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A-1

Barr[i]

C0

Di

Attempts:

3 left

💡 Hint

Common Mistakes

Returning arr[i] which is zero instead of the index.

Returning 0 or -1 incorrectly inside the loop.

We return the index i where zero is found, not the element arr[i].

4fill in blank

hard

Fill both blanks to return the sum of positive numbers in the array, stopping early if a zero is found.

C++

int sumPositives(int arr[], int size) {
    int sum = 0;
    for (int i = 0; i < size; i++) {
        if (arr[i] == 0) {
            return [1];
        }
        if (arr[i] > 0) {
            sum [2] arr[i];
        }
    }
    return sum;
}

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Asum

B+=

C-=

Darr[i]

Attempts:

3 left

💡 Hint

Common Mistakes

Returning arr[i] instead of sum.

Using -= instead of += to add values.

Return the current sum when zero is found, and add positive numbers to sum using +=.

5fill in blank

hard

Complete the code to return the first character in the string that is a vowel, or '\0' if none.

C++

char firstVowel(const char* str) {
    for (int i = 0; str[i] != '\0'; i++) {
        char c = str[i];
        if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u') {
            return [1];
        }
    }
    return '\0';
}

Drag options to blanks, or click blank then click option'

A[

B]

Cc

Dstr

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of brackets to access characters.

Returning str instead of the character c.

Use brackets [ ] to access characters by index and return the character c when it is a vowel.