You want to write a Bash function sum that takes two numbers as arguments and prints their sum. Which script correctly calls the function and prints the result?

hard🚀 Application Q15 of 15

Bash Scripting - Functions

You want to write a Bash function sum that takes two numbers as arguments and prints their sum. Which script correctly calls the function and prints the result?

<pre>sum() {
  echo $(($1 + $2))
}
sum 3 5</pre>

<pre>sum() {
  echo $1 + $2
}
sum 3 5</pre>

<pre>sum() {
  echo $((1 + 2))
}
sum 3 5</pre>

<pre>sum() {
  echo $1 $2
}
sum 3 5</pre>

Step-by-Step Solution

Solution:

Step 1: Understand arithmetic evaluation in Bash
To add numbers, use $((expression)). Inside, use $1 and $2 for arguments.
Step 2: Check each option's output
```
sum() {
  echo $(($1 + $2))
}
sum 3 5
```
correctly sums $1 + $2.
```
sum() {
  echo $1 + $2
}
sum 3 5
```
prints literal string with plus sign.
```
sum() {
  echo $((1 + 2))
}
sum 3 5
```
adds 1 and 2 literally, ignoring arguments.
```
sum() {
  echo $1 $2
}
sum 3 5
```
prints arguments separated by space.
Final Answer:
sum() { echo $(($1 + $2)) } sum 3 5 -> Option A
Quick Check:
Use $(( $1 + $2 )) for sum [OK]

Quick Trick: Use $(( $1 + $2 )) to add arguments inside function [OK]

Common Mistakes:

MISTAKES

Printing arguments without arithmetic evaluation
Using fixed numbers instead of arguments
Confusing string concatenation with addition

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More Bash Scripting Quizzes

You want to write a Bash function sum that takes two numbers as arguments and prints their sum. Which script correctly calls the function and prints the result?

Step 1: Understand arithmetic evaluation in Bash

Step 2: Check each option's output

Final Answer:

Quick Check:

Want More Practice?