String Zig Zag Pattern

                                                                String Zig Zag Pattern

Given a string S and an integer N as the input, the program must split the string into groups whose size is N and print them as the output in separate lines in a zig zag manner. If the last group size is less than N then the remaining letters must be filled with asterisk as shown in the Example Input/Output.

Input Format:
The first line contains S.
The second line contains N.

Output Format:
LENGTH(S)/N + LENGTH(S)%N lines containing the desired pattern.

Boundary Conditions:
4 <= LENGTH(S) <= 500
2 <= N <= LENGTH(S)

Example Input/Output 1:
Input:
ENVIRONMENT
3

Output:
ENV
ORI
NME
*TN

Example Input/Output 2:
Input:
ENVIRONMENT
4

Output:
ENVI
MNOR
ENT*

Example Input/Output 3:
Input:
EVERYDAY
2

Output:
EV
RE
YD
YA

C++program:

#include <iostream>

using namespace std;

int main(int argc, char** argv)

{

string s;

int n,c=0,l;

cin>>s;

cin>>n;

l=s.length();

while(l%n!=0)

{

s.append("*");

l=s.length();

}

int i=0,t=0;

while(i<l)

    {

    cout<<s[i];

    c++;

    if(c==n)

    {

    c=0;

    cout<<"\n";

    i=i+n;

    t++;

    }

    else

    {

    if(t%2==0)

    i++;

    else

    i--;

    }

}

}