C Brain Teasers: Exercise Your Mind/

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Discussion: Loop Up and Down

Discussion: Loop Up and Down

Execute the code to understand the output and gain insights into for loops.

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Run the code

Now, it's time to execute the code and observe the output.

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#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);
}

Understanding the output

The code shows the output of both variables u and d as they ascend and descend from zero:

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

A single loop both initializes and increments/decrements each value, setting what could be multiple statements into the for loop statement itself.

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