CS50: W2 Practice Problem: Password

1

Hey guys! First post and I am really excited to share my solution to the practice problem “Password” from W2 of CS50!! I was really struggling in W1 with loops and now even with W2 with bool expressions and arrays but I am really proud to say that I found this solution all on my own! Every problem so far I’ve needed a tutorial (or even just retyping someone else’s code till it clicked), so its nice to see all my hardworking taking effect :slight_smile:

// Practice iterating through a string
// Practice using the ctype library

#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdbool.h>

bool valid(string password);

int main(void)
{
    string password = get_string("Enter your password: ");
    if (valid(password))
    {
        printf("Your password is valid!\n");
    }
    else
    {
        printf("Your password needs at least one uppercase letter, lowercase letter, number and symbol\n");
    }
}

// TODO: Complete the Boolean function below
bool valid(string password)
{

    bool upper = false;
    bool lower = false;
    bool num = false;
    bool sym = false;
    int pass_length = strlen(password);

    for (int i = 0; i < pass_length; i++) {
        if(islower(password[i])) {
            lower = true;
        }
    }

    for (int i = 0; i < pass_length; i++) {
        if (isupper(password[i])) {
            upper = true;
        }
    }

    for (int i = 0; i < pass_length; i++) {
        if (isdigit(password[i])) {
            num = true;
        }
    }

    for (int i = 0; i < pass_length; i++) {
        if (ispunct(password[i])) {
            sym = true;
        }
    }

    if (sym == true && num == true && upper == true && lower == true) {
        return true;
    }
    else
        return false;
}

type or paste code here
2

Nice job. Keep practicing and avoid directly looking at the solution if you can help it; and you’ll keep getting better and better at writing code.

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