# HackerRank More on Conditionals problem solution

In this HackerRank More on Conditionals problem solution if statements in Bash are often used in four important ways:

1. if...then...fi statements
2. if...then...fi...else statements
3. if..elif..else..fi
4. if..then..else..if..then..fi..fi.. (Nested Conditionals)

Their structure is

if [[ condition ]]

then

do this

elif [[ condition ]]; then

do this

else

do this by default

fi

Note that there must be spaces between the brackets and their enclosing text. An or condition is || and an and condition is &&. Also note that then is required after if and elif but not after else. It must be separated from the conditional by either a newline or a ; which represents a newline to bash. The entire if clause is terminated with fi.

Given three integers (X, Y, and Z) representing the three sides of a triangle, identify whether the triangle is scalene, isosceles, or equilateral.

If all three sides are equal, output EQUILATERAL.

Otherwise, if any two sides are equal, output ISOSCELES.

Otherwise, output SCALENE.

## Problem solution.

```function readInt {
echo \$line
}

if [ \$a = \$b ] && [ \$a = \$c ]; then
echo "EQUILATERAL";
elif [ \$a = \$b ] || [ \$a = \$c ] || [ \$b = \$c ]; then
echo "ISOSCELES";
else
echo "SCALENE";
fi
```

## Second solution.

```#! /bin/bash