Multiple input and output in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read two integers from the user.

C

#include <stdio.h>

int main() {
    int a, b;
    printf("Enter two numbers: ");
    scanf([1], &a, &b);
    printf("You entered %d and %d\n", a, b);
    return 0;
}

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

A"%d %d"

B"%s %s"

C"%c %c"

D"%f %f"

Attempts:

3 left

💡 Hint

Common Mistakes

Using %f or %c instead of %d for integers.

Forgetting to use & before variable names in scanf.

The scanf format specifier "%d %d" reads two integers from input.

2fill in blank

medium

Complete the code to print two floating-point numbers with two decimal places.

C

#include <stdio.h>

int main() {
    float x = 3.1415, y = 2.7182;
    printf([1], x, y);
    return 0;
}

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

A"%c %c\n"

B"%d %d\n"

C"%.2f %.2f\n"

D"%f %f\n"

Attempts:

3 left

💡 Hint

Common Mistakes

Using %d to print floats.

Not specifying decimal places, leading to many decimals.

The format "%.2f" prints a floating-point number with two digits after the decimal point.

3fill in blank

hard

Fix the error in the code to correctly read a character and an integer.

C

#include <stdio.h>

int main() {
    char c;
    int n;
    printf("Enter a character and a number: ");
    scanf("%c [1]", &c, &n);
    printf("You entered %c and %d\n", c, n);
    return 0;
}

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

A%f

B%d

C%c

D%s

Attempts:

3 left

💡 Hint

Common Mistakes

Using %c twice in scanf.

Using %f or %s for integers.

After reading a character with %c, use %d to read an integer.

4fill in blank

hard

Fill both blanks to read and print two integers separated by a space.

C

#include <stdio.h>

int main() {
    int a, b;
    printf("Enter two integers: ");
    scanf([1], &a, &b);
    printf([2], a, b);
    return 0;
}

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

A"%d %d"

B"%f %f"

C"%d %d\n"

D"%c %c"

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong format specifiers in scanf or printf.

Forgetting newline in printf.

Use "%d %d" to read two integers and "%d %d\n" to print them with a newline.

5fill in blank

hard

Fill all three blanks to read a character, an integer, and a float, then print them.

C

#include <stdio.h>

int main() {
    char ch;
    int num;
    float val;
    printf("Enter a character, an integer, and a float: ");
    scanf([1], &ch, &num, &val);
    printf([2], ch, num, val);
    return [3];
}

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

A"%c %d %f"

B"%c %d %f\n"

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up format specifiers.

Forgetting newline in printf.

Returning 1 instead of 0.

Use "%c %d %f" to read char, int, float; "%c %d %f\n" to print them; return 0 to end program.