Question

please help with this c++ function for my study guide

Write the function repeatFront such that given a string and an int n, it returns a string made of the first n characters of the string, followed by the first n-1 characters of the string, and so on. You may assume that n is between 0 and the size of the string, inclusive (i.e. n >= 0 and n <= str.size()). Hint: Solve this problem by using C++ strings not C-strings. Examples: repeatFront("Chocolate", 4) → "ChocChoChC" repeatFront("Chocolate", 3) → "ChoChC" repeatFront("Ice Cream", 2) → "IcI" repeatFront("Ice Cream", 0) → ""

Answer 1

string repeatFront(string str, int n) {
    string res=str.substr(0,n);
    for(int i=1;i<n;i++){
        res=res+str.substr(0,n-i);
    }
    return res;
}