Macro with arguments - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a macro named SQUARE that calculates the square of a number.

C

#define SQUARE([1]) (([1]) * ([1]))

int main() {
    int x = 5;
    int result = SQUARE(x);
    return 0;
}

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

Anum

Bx

Cval

Dn

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put parentheses around the argument in the macro definition.

Using invalid characters or spaces in the macro argument.

The macro argument name can be any valid identifier. Here, n is used as the argument name for clarity.

2fill in blank

medium

Complete the macro definition to create a macro MAX that returns the maximum of two values a and b.

C

#define MAX(a, b) (([1]) > (b) ? (a) : (b))

int main() {
    int max_val = MAX(3, 7);
    return 0;
}

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

AMAX

Ba

Cb

Dc

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the arguments in the comparison, which changes the logic.

Forgetting parentheses around macro arguments.

The macro compares a and b. The first operand in the comparison should be a.

3fill in blank

hard

Fix the error in the macro to correctly compute the cube of a number x.

C

#define CUBE(x) (([1]) * (x) * (x))

int main() {
    int c = CUBE(3);
    return 0;
}

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

Ax

BCUBE

C3

Dy

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different variable name than the macro argument.

Hardcoding a number instead of using the argument.

The macro argument x must be used consistently to compute the cube.

4fill in blank

hard

Fill both blanks to define a macro MIN that returns the minimum of two values x and y.

C

#define MIN([1], [2]) ((([1]) < ([2])) ? ([1]) : ([2]))

int main() {
    int m = MIN(10, 20);
    return 0;
}

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

Ax

By

Ca

Db

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing argument names or using different names in different parts.

Forgetting parentheses around arguments.

The macro arguments are x and y. Use them consistently in the macro.

5fill in blank

hard

Fill all three blanks to define a macro SWAP that swaps two variables a and b using a temporary variable temp.

C

#define SWAP([1], [2], [3]) \
    do { \
        int [3] = [1]; \
        [1] = [2]; \
        [2] = [3]; \
    } while(0)

int main() {
    int x = 5, y = 10;
    SWAP(x, y, temp);
    return 0;
}

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

Aa

Bb

Ctemp

Dswap

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for the temporary variable and one of the variables to swap.

Forgetting the do-while(0) structure for safe macro usage.

The macro swaps variables a and b using a temporary variable temp.