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

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Aarr[i]

Bi

Csize

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the index instead of the value.

Returning a constant like 0 instead of the found number.

The function returns the first even number found in the array, so it should return arr[i].

2fill in blank

medium

Complete the code to return the index of the first negative number in the array.

C

int first_negative_index(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

Bi

Csize

Darr[i]

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the value instead of the index.

Returning the array size or a constant.

The function should return the index where the first negative number is found, so it returns i.

3fill in blank

hard

Fix the error in the code to return the sum of positive numbers, stopping early if a zero is found.

C

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

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Abreak

Bcontinue

Creturn sum

Dreturn 0

Attempts:

3 left

💡 Hint

Common Mistakes

Using break instead of return, which only exits the loop but not the function.

Using continue, which skips the current iteration but does not stop.

When zero is found, the function should return the current sum immediately, so use return sum;.

4fill in blank

hard

Fill both blanks to return the first number greater than 10 and its index.

C

int* first_greater_than_ten(int arr[], int size) {
    static int result[2];
    for (int i = 0; i < size; i++) {
        if (arr[i] [1] 10) {
            result[0] = arr[i];
            result[1] = [2];
            return result;
        }
    }
    return NULL;
}

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A>

B<

Ci

Darr[i]

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Storing the value instead of the index in the second result element.

The condition should check if the number is greater than 10 using >, and the index i is stored as the second element.

5fill in blank

hard

Fill all three blanks to return the first negative number, its index, and stop the loop.

C

int find_negative(int arr[], int size, int *index) {
    for (int i = 0; i < size; i++) {
        if (arr[i] [1] 0) {
            *index = [2];
            [3] arr[i];
        }
    }
    *index = -1;
    return 0;
}

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

A<

Bi

Creturn

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators.

Not returning immediately, causing wrong results.

The condition checks if the number is less than zero using <. The index is set to i, and the function returns the found negative number immediately with return.