caracfun.cpp

// caracfun.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <string.h>
#include <stdlib.h>

char *replicar(char letra, int n)
{
	char *str;
	str = (char *)malloc((n+1)*sizeof(char));
	for(int i = 0; i < n; i++)
		str[i] = letra;
	str[n] = '\0';
	return str;
}

char *esquerda(char *s, int n)
{
	char *str;
	int quant_carac;
	str = (char *)malloc((n+1)*sizeof(char));
	if (strlen(s) < n)
		quant_carac = strlen(s);
	else
		quant_carac = n;
	for(int i = 0; i < quant_carac; i++)
		str[i] = s[i];
	str[quant_carac] = '\0';
	return str;

}

char *direita(char *s, int n)
{
	char *str;
	int quant_carac;
	int len_s, cont = 0;
	str = (char *)malloc((n+1)*sizeof(char));
	if (strlen(s) < n)
		quant_carac = strlen(s);
	else
		quant_carac = n;
	len_s = strlen(s); 
	for(int i = len_s - quant_carac; i < len_s ; i++)
	{
		str[cont] = s[i];
		cont++;
	}
	str[quant_carac] = '\0';
	return str;

}

char * numpcaraczero(int v, int c)
{
	char num[100];
	char *buff;
	char *str;
	str = (char *)malloc((c+1)*sizeof(char));
	buff = replicar('0', c);
	itoa(v, num, 10);
	strcat(buff, num); 
	return direita(buff, c); 
}

void insere(char *vet, char *subs, int pos)
{
	char *x, *y, *s;
	x = esquerda(vet, pos);
	y = direita(vet, strlen(vet) - pos);
	vet[0] = '\0';
	strcat(vet, x);
	strcat(vet, subs);
	strcat(vet, y);
}


int _tmain(int argc, _TCHAR* argv[])
{
	char cidade[100] = "RioJaneiro";
	char numero[100] = "";
	strcpy(numero, numpcaraczero(12, 10));
	printf("%s\n", numero);
	insere(cidade, " de ", 3);
	printf("%s\n", cidade);
	return 0;
}