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C Brain Teasers: Exercise Your Mind

Loop Up and Down

Explore the behavior of loops in C programming by analyzing puzzle code. Learn to predict output and deepen your understanding of loop mechanics in practical contexts.

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Puzzle code

Read carefully the code given below:

C++
#include <stdio.h>
int main()
{
    int u,d;
    for( u=0, d=0; u<11; u++, d-- )
    printf("%2d %2d\n", u, d);
    return(0);
}

Your task: Guess the output

Attempt the following test to assess your understanding.

Technical Quiz
1.

What is the expected output of the above code?

A.

0 0
1 -1
2 -2
3 -3
4 -4
5 -5
6 -6
7 -7
8 -8
9 -9
10 -10

B.

0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10

C.

0 0
2 -2
4 -4
6 -6
8 -8
10 -10

D.

0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9

1 / 1

Let's discuss the code and output together in the next lesson.