Ajuda com vetores c++

[Gui_cpp]

Preciso muito de ajuda de como trabalhar com vetores estou me dando mal nessa matéria na faculdade. Qualquer ajuda sera muito bem vinda.

-Enunciado da questão : Faça um programa que recebe um numero inteiro com no minimo 3 digitos e cria uma representação textual para o numero com virgula antes dos dois últimos dígitos, além de pontos para separar outro dígitos de três em trés para facilitar a leitura.

-como o numero pode ter muitos digitos, e eles devem ser processados individualmente, é recomendado que seu armazenamento seja feito numa string(array de char) com capacidade para cerca de 40 digitos. O numero processado também deve usar o mesmo tipo.

-O programa não deve apenas escrever o numero formatado, ele deve guardar a string numa variavel (vetor) antes de escrever.

-Exemplo de entrada : 2187483647

-Exemplo de saída : 21.874.836,47

Não consigo nem começar o código pessoal por favor qualquer dica sera de muito valor.

Lembrando : em c++.

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