View Code of Problem 101

#include<iostream>
#include<cstring>
using namespace std;

int main()
{
    char str[100],num[100];
    while(gets(str))
    {
        int j=0;
        for(int i=0; str[i]!='\0'; i++)
        {
            if(str[i]!=',')
                num[j++]=str[i];
        }
        num[j]='\0';

        int k=strlen(num)%3;
        for(int i=0; i<k; i++)
            cout<<num[i];

        for(int i=k,j=0; num[i]!='\0'; i++,j++)
        {
            if(j%3==0&&i>0)
                cout<<','<<num[i];
            else
                cout<<num[i];
        }
        cout<<endl;
    }

    return 0;
}

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