[Solved] What will be the output of this MATLAB code?fileID = fopen('numbers.txt', 'w'); fprintf(fileID, '%d\n', [1 2 3]); fclose(fileID); fileID = fopen('numbers.txt', 'r'); data = fscanf(fileID, '%d');... | MATLAB

MATLAB - File I/O

What will be the output of this MATLAB code?

fileID = fopen('numbers.txt', 'w');
fprintf(fileID, '%d\n', [1 2 3]);
fclose(fileID);
fileID = fopen('numbers.txt', 'r');
data = fscanf(fileID, '%d');
fclose(fileID);
data

A[1 2 3]

B[1; 2; 3]

C[123]

DError: file not found

Step-by-Step Solution

Solution:

Step 1: Write numbers to file with fprintf
fprintf writes each number on a new line because of '\n'.
Step 2: Read numbers with fscanf
fscanf reads numbers into a column vector by default.
Final Answer:
[1; 2; 3] -> Option B
Quick Check:
fscanf reads numbers as column vector [OK]

Quick Trick: fscanf reads numeric data as column vector by default [OK]

Common Mistakes:

Expecting row vector output
Thinking fscanf reads all numbers as one integer
Assuming file does not exist after writing

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More MATLAB Quizzes

What will be the output of this MATLAB code?

Step 1: Write numbers to file with fprintf

Step 2: Read numbers with fscanf

Final Answer:

Quick Check:

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