Question

Explain why the value of the expression 2 + 3 + "test" is the string "5test" while the value of the expression "test" + 2 + 3 is the string "test23".

What is the value of "test" + 2 * 3 ?

Answer 1

Case 1

2 + 3 + "test"    will give the string "5test"

When the + operator is used with String,it can concatenate the strings

Here first 2+3 (2 and 3 are integers) is evaluated which gives us 5, now 5+"test" needs to be executed

Since when we add a number and a string using a + operator it gives us a String

Therefor our output is "5test"

case 2

"test" + 2 + 3 will give the output as "test23"

Firstly "test" + 2 is evaluated, which returns test2 because a string + number is a string.

Now we have string "test2" which has to be added with 2

"test2" + 3 will return "test23" since adding a string with a number will return a string.

"test" + 2 * 3

The value of expression will be test6

Since the precedence of * is more than + operator,So first 2*3 is evaluated which gives us 6.

Now we have "test" + 6 which will return "test6",as we already know that on adding a String with number will always return a String