C/Visual C - Inserción en cadena

#include<stdio.h>

#include<string.h>

#include<math.h>

#include<stdlib.h>

int convertir(int dec, int basef){

	char cadena[64] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};

	char numero[64] = "";

	while(dec>0){

		sprintf(numero,"%c",cadena[dec%basef]);

		dec = dec/basef;

	}

	printf("%s",numero);

	return 0;

}

#include <stdio.h>

int main ()

{

  char buffer [50];

  int n, a = 5, b = 3;

  n = sprintf (buffer, "%d mas %d es %d", a, b, a+b);

  printf ("[%s] es una cadena de %d caracteres de longitud\n",buffer,n);

  return 0;

}