cripto

#include <string.h>
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

void afisare(int vector[201]) {
    for (int i = vector[0]; i > 0; i--)
        cout << vector[i];
}

void suma(int numar1[201], int numar2[201], int suma_mare[201]) {

    int transport = 0, n;
    if (numar1[0] < numar2[0]) {
        n = numar2[0];
        for (int i = numar1[0] + 1; i <= numar2[0]; i++)
            numar1[i] = 0;
    }
    else {
        n = numar1[0];
        for (int i = numar2[0] + 1; i <= numar1[0]; i++)
            numar2[i] = 0;
    }
    int i;
    for (i = 1; i <= n; i++) {
        int cifra = numar1[i] + numar2[i] + transport;
        suma_mare[i] = cifra % 10;
        transport = cifra / 10;
    }
    if (transport)
        suma_mare[i] = transport;
    else
        i--;
    suma_mare[0] = i;
    afisare(suma_mare);
}

void diferenta(int numar1[201], int numar2[201], int diferenta_mare[201]) {
    if (numar1[0] < numar2[0])
        diferenta(numar2, numar1, diferenta_mare);
    else {
        int i, t = 0;
        for (i = 1; i <= numar1[0]; i++) {
            diferenta_mare[i] = numar1[i] - numar2[i] + t;
            if (diferenta_mare[i] < 0) {
                diferenta_mare[i] += 10;
                t = -1;
            }
            else
                t = 0;
        }
        i--;
        while (i && !diferenta_mare[i])
            i--;
        if (i == 0) {
            printf("0");
        }
        else {
            diferenta_mare[0] = i;

            afisare(diferenta_mare);
        }
    }
}

void inmultire(int a[200], int numar) {
    if (numar == 0) {
        cout << "0";
        exit(0);
    }
    int i, t = 0;
    for (i = 1; i <= a[0]; i++) {
        a[i] = a[i] * numar + t;
        t = a[i] / 10;
        a[i] = a[i] % 10;
    }
    while (t) {
        a[++a[0]] = t % 10;
        t /= 10;
    }
    afisare(a);
    cout << "\n";
}

int main()
{
    int a[200] = { 0 }, b[200] = { 0 }, sumanr[200] = { 0 }, diferentanr[200] = { 0 }, scalar;
    string nr1, nr2, scalar1;
    ifstream f("numar_mare.txt");
    getline(f, nr1);
    getline(f, nr2);
    getline(f, scalar1);
    a[0] = nr1.length();
    b[0] = nr2.length();
    scalar = stoi(scalar1);
    for (int i = nr1.length() - 1; i >= 0; i--)
    {
        a[nr1.length() - i] = (int)(nr1[i] - '0');
    }
    for (int i = nr2.length() - 1; i >= 0; i--)
    {
        b[nr2.length() - i] = (int)(nr2[i] - '0');
    }
    suma(a, b, sumanr);
    cout << "\n";
    diferenta(a, b, diferentanr);
    cout << "\n";
    inmultire(a, scalar);


}