index = index + 1 in Java are used quite often, so the creators of the language added an abbreviated version of the record:
index + = 1.
It is important to understand that the differences are only in the way of recording.
Such abbreviations are called “syntactic sugar”, because they make the process of writing code a little easier and more pleasant, “sweetening” it :)
There are abbreviated forms for all arithmetic operations and for string concatenation:
a = a + 1→
a += 1
a = a - 1→
a -= 1
a = a * 2→
a *= 2
a = a / 1→
a /= 1
a = a +" bla"→
countChars function, which counts repetitions of the specified character in a string. (In programming, they say “the number of occurrences of a character in a string”).
The function takes two parameters as input: a string and a character. The function returns a number.
var str = "If I look back I am lost"; countChars(str, 'I'); // => 3 countChars(str, 'z'); // => 0 countChars(str, 'o'); // => 3
The idea is to create a separate counter variable and increment it by 1 each time the specified character is found in a line. You will need to nest a conditional statement in the loop body. To increase the counter, use syntactic sugar.
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