Return values in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the sum of two integers.

C

int add(int a, int b) {
    return [1];
}

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

Aa - b

Ba + b

Ca * b

Da / b

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction or multiplication instead of addition.

Forgetting to return a value.

The function should return the sum of a and b, so a + b is correct.

2fill in blank

medium

Complete the code to return the maximum of two integers.

C

int max(int x, int y) {
    if (x > y) {
        return [1];
    } else {
        return y;
    }
}

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

Ax

B0

Cy

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the wrong variable inside the if block.

Returning a constant instead of a variable.

If x is greater than y, the function should return x.

3fill in blank

hard

Fix the error in the function to correctly return the length of a string.

C

#include <string.h>

int string_length(char *str) {
    int len = strlen(str);
    return [1];
}

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

A&len

Bstr

C*str

Dlen

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the string pointer instead of the length.

Returning the address of the length variable.

The function calculates the length and stores it in len, so it should return len.

4fill in blank

hard

Fill both blanks to return the product of two numbers and print it.

C

#include <stdio.h>

int multiply(int a, int b) {
    return [1];
}

int main() {
    int result = multiply(3, 4);
    printf("Product: %d\n", [2]);
    return 0;
}

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

Aa * b

Ba + b

Cresult

D3 * 4

Attempts:

3 left

💡 Hint

Common Mistakes

Returning sum instead of product.

Printing the wrong variable or expression.

The function should return the product a * b, and the printf should print the variable result which holds the product.

5fill in blank

hard

Fill all three blanks to create a function that returns the absolute value of an integer and use it in main.

C

#include <stdio.h>

int absolute([1] num) {
    if (num [2] 0) {
        return -num;
    } else {
        return num;
    }
}

int main() {
    int val = -10;
    int abs_val = absolute([3]);
    printf("Absolute value: %d\n", abs_val);
    return 0;
}

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

Aint

B<

Cval

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong data type for parameter.

Using wrong comparison operator.

Passing wrong variable to the function.

The function parameter should be an int. The condition checks if num < 0. In main, we pass val to the function.