【cs 50 2022】lab2 && problem set2

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

// Points assigned to each letter of the alphabet
int POINTS[] = {1, 3, 3, 2, 1, 4, 2, 4, 1, 8, 5, 1, 3, 1, 1, 3, 10, 1, 1, 1, 1, 4, 4, 8, 4, 10};

int compute_score(string word);

int main(void)
{
    // Get input words from both players
    string word1 = get_string("Player 1: ");
    string word2 = get_string("Player 2: ");

    // Score both words
    int score1 = compute_score(word1);
    int score2 = compute_score(word2);

    // TODO: Print the winner
    if(score1 > score2){
        printf("player 1 wins!\n");
    }
    else if(score1 == score2){
        printf("both win!\n");
    }else{
        printf("player 2 wins!\n");
    }
}

int compute_score(string word)
{
    int n = strlen(word);
    int score = 0;
    int flag = 0;
    for(int i=0;i<n;i++){
        if(word[i]>64 && word[i]<91){
            flag =  (int)(word[i]-65);
        }
        else if(word[i]>96 && word[i]<123){
            flag = (int)(word[i]-97);
        }
        else{
            printf("please check the input!\n");
        }
        score += POINTS[flag];
    }
    return score;
    // TODO: Compute and return score for string
}

#include <cs50.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

const int BITS_IN_BYTE = 8;

void print_bulb(int bit);

int main(void)
{
    // TODO
    string message = get_string("Message: ");
    int n = strlen(message);
    int number = 0;
    int flag = 0;
    for(int i=0;i<n;i++){
        number = (int)message[i];
        //printf("number:%i\n",number);
        int bit = 0;
        for(int j=7;j>=0;j--){
            flag = pow(2,j);
            // printf("flag:%i-%i",j,flag);
           if(number<flag){
                bit = 0;
           }
           else{
                bit = 1;
                number -= flag;
           }
           //printf("%i",bit);
            print_bulb(bit);
        }
        printf("\n");
    }
}

void print_bulb(int bit)
{
    if (bit == 0)
    {
        // Dark emoji
        printf("\U000026AB");
    }
    else if (bit == 1)
    {
        // Light emoji
        printf("\U0001F7E1");
    }
}

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

int main(int argc, string argv[])
{
    int k = atoi(argv[1]);
    if(argc != 2 || k<0 || k>126){
        printf("Usage: ./caesar key\n");
        return 1;
    }
    string check_input = argv[1];
    int m = strlen(check_input);
    int flag = 0;
    for(int i=0;i<m;i++){
        if(isdigit(check_input[i])){
            continue;
        }
        flag++;
    }
    if(flag == 0){
        string text = get_string("plaintext: ");
        int n = strlen(text);
        printf("ciphertext:");
        for(int i=0;i<n;i++){
            if(isalpha(text[i])){
                if(isupper(text[i])){
                    printf("%c",(text[i] - 65 + k) % 26 + 65);
                }
                else{
                    printf("%c",(text[i] - 97 + k) % 26 + 97);
                }
            }
            else{
            printf("%c",text[i]);
            }
        }
        printf("\n");
        return 0;
    }
    printf("Usage: ./caesar key\n");
    return 1;
}