For_each loop issue

#1

why the syntax written in the webinar is not working in codeblocks?
but the syntax
for_each(s.begin(),s.end(),print1);
is working?

#2

Hello @Rj.25

Please mention the syntax given in the webinar that is Not working in codeblocks.
Also mention the time in the webinar at which the syntax is given.

#3

another question :can you explain how comparator works for binary search?

#4

Hello @Rj.25

Comparator is a function which takes as input two parameters of same data type and tells whether the first should come before or after the second parameter in sorted order.
Example:
we have an array of strings arr[]: “apple”, “banana”, “sky”, “home”.
if we would like to sort the above strings on the basis of their length i.e., greater length comes first then we can say sort(arr, arr + arr.size(), compare);

where compare function is

bool compare(string a, string b) {
    if(a.length() > b.length()) {
        return true;
    } else {
        return false;
    }
}

Here the sort function uses the “comapre” comparator to compare two strings (whether the first should come before or after the second string in sorted order).
comparator is just a function which tells the sort function the basis for sorting some objects.

Let me know if you need any other help.

#5

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