// strlen1, strcpy1
#include <iostream>

using namespace std;

#define UINT unsigned int

UINT strlen1(const char str[]) {
    int len = 0;
    while (str[len] != '\0') {
        len++;
    }
    return len;
}

void strcpy1(char dest[], char src[]) {
    int i = 0;
    while (src[i] != '\0') {
        dest[i] = src[i];
        i++;
    }
    dest[i] = '\0';
}

int main(int argc, char **argv) {
    cout << "Input: "<< argv[1] << endl;
    cout << "Length: "<< strlen1(argv[1]) << endl;
    char inputCopy[25];
    strcpy1(inputCopy, argv[1]);
    cout << "Copy: "<< inputCopy << endl;
    return 0;
}


// факторіал
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

long long factorial(int n) {
    if (n == 0) {
        return 1;
    } else {
        return n * factorial(n - 1);
    }
}

int main(int argc, char **argv) {
    int n = atoi(argv[1]);
    cout << "Factorial of "<< n << ": " << factorial(n) << endl;
    return 0;
}