While loop in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a while loop.

C

#include <stdio.h>

int main() {
    int i = 1;
    while ([1]) {
        printf("%d\n", i);
        i++;
    }
    return 0;
}

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Ai >= 6

Bi > 6

Ci == 6

Di < 6

Attempts:

3 left

💡 Hint

Common Mistakes

Using a condition that never becomes false, causing an infinite loop.

Using the wrong comparison operator.

The while loop continues as long as the condition is true. To print numbers 1 to 5, the condition should be i < 6.

2fill in blank

medium

Complete the code to sum numbers from 1 to 10 using a while loop.

C

#include <stdio.h>

int main() {
    int sum = 0;
    int num = 1;
    while ([1]) {
        sum += num;
        num++;
    }
    printf("Sum is %d\n", sum);
    return 0;
}

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Anum < 10

Bnum <= 10

Cnum == 10

Dnum > 10

Attempts:

3 left

💡 Hint

Common Mistakes

Stopping the loop before reaching 10, missing the last number.

Using a condition that never ends.

The loop should run while num is less than or equal to 10 to include 10 in the sum.

3fill in blank

hard

Fix the error in the while loop condition to avoid an infinite loop.

C

#include <stdio.h>

int main() {
    int count = 5;
    while ([1]) {
        printf("%d\n", count);
        count--;
    }
    return 0;
}

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Acount > 0

Bcount >= 5

Ccount < 5

Dcount == 5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a condition that never becomes false.

Using equality which causes the loop to run only once.

The loop should continue while count is greater than 0 to avoid infinite looping.

4fill in blank

hard

Fill both blanks to create a while loop that prints even numbers from 2 to 10.

C

#include <stdio.h>

int main() {
    int num = [1];
    while (num [2] 10) {
        printf("%d\n", num);
        num += 2;
    }
    return 0;
}

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A2

B<=

C<

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Starting from 1 instead of 2.

Using a condition that excludes 10.

Start from 2 and continue while num is less than or equal to 10 to print even numbers up to 10.

5fill in blank

hard

Fill all three blanks to create a while loop that counts down from 10 to 1 and prints each number.

C

#include <stdio.h>

int main() {
    int count = [1];
    while (count [2] 0) {
        printf("%d\n", [3]);
        count--;
    }
    return 0;
}

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A0

Bcount

C>

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect start value.

Using wrong comparison operator.

Printing a wrong variable.

Start counting from 10, continue while count is greater than 0, and print the current count.