sum of elements in 2d array in c - Wikitechy https://www.wikitechy.com/interview-questions/tag/sum-of-elements-in-2d-array-in-c/ Interview Questions Fri, 03 Sep 2021 05:45:29 +0000 en-US hourly 1 https://wordpress.org/?v=6.9 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png sum of elements in 2d array in c - Wikitechy https://www.wikitechy.com/interview-questions/tag/sum-of-elements-in-2d-array-in-c/ 32 32 Ravi and Rupali are asked to write a program to sum the rows of 2X2 matrices stored in the array A..? https://www.wikitechy.com/interview-questions/recursion-and-iteration/ravi-and-rupali-are-asked-to-write-a-program-to-sum-the-rows-of-2x2-matrices-stored-in-the-array-a/ https://www.wikitechy.com/interview-questions/recursion-and-iteration/ravi-and-rupali-are-asked-to-write-a-program-to-sum-the-rows-of-2x2-matrices-stored-in-the-array-a/#respond Sat, 28 Aug 2021 17:26:14 +0000 https://www.wikitechy.com/interview-questions/?p=2652

Ravi and Rupali are asked to write a program to sum the rows of 2X2 matrices stored in the array A.
Ravi writes the following code (Code A):

 for n = 0 to 1 
 sumRow1[n] = A[n][1] + A[n][2]
 end

Rupali writes the following code (Code B):

sumRow1[0] = A[0][1] + A[0][2] 
sumRow1[1] = A[1][1] + A[1][2]

Comment upon these codes (Assume no loop unrolling done by compiler) ?

A. Code a will execute faster than b.

B. Code b will execute faster than a.

C. Code a is logically incorrect.

D. Code b is logically incorrect

Answer : B. Code b will execute faster than a

Explanation:

  • Both codes are taking two steps of operation, so same complexity.
  • But if we consider the overhead of looping (as it takes time to increment counter) then code b will be faster.
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