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// Sumar números enteros sin signo almacenados en cadenas
// Agosto de 2009 Con Clase, Salvador Pozo
#include <iostream>
#include <cstring>
using namespace std;
const unsigned int cadmax = 32;
typedef char numero[cadmax];
bool Sumar(numero, numero, numero);
int max(int, int);
int main()
{
numero n1="999999999999999999";
numero n2="1";
numero suma;
Sumar(n1, n2, suma);
cout << n1 << " + " << n2 << " = " << suma << endl;
return 0;
}
bool Sumar(numero n1, numero n2, numero r) {
// Primero, buscar los dÃgitos de la derecha:
char c1,c2;
int acarreo = 0;
int lon1=strlen(n1);
int lon2=strlen(n2);
// Colocar el terminador de la cadena resultado:
r[max(lon1, lon2)] = 0;
// Hacer la suma, digito a digito:
do {
lon1--;
lon2--;
if(lon1 < 0) c1 = '0'; else c1 = n1[lon1];
if(lon2 < 0) c2 = '0'; else c2 = n2[lon2];
r[max(lon1, lon2)] = acarreo+c1+c2-'0';
if(r[max(lon1, lon2)] > '9') { r[max(lon1, lon2)]-=10; acarreo=1; }
else acarreo = 0;
} while(lon1 > 0 || lon2 > 0);
// Desbordamiento:
if(acarreo) {
if(strlen(r) < cadmax) {
for(int i=strlen(r)+1; i > 0; i--) r[i] = r[i-1];
r[0] = '1';
return false;
}
}
return true;
}
int max(int a, int b) {
if(a > b) return a;
return b;
}
Compiling Program...
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