【cs50 2022】lab1 && problem set1

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

int main(void)
{
    // TODO: Prompt for start size
    int start_size;
    do{
        start_size = get_int("Start size: ");
    }
    while(start_size<9);
    // TODO: Prompt for end size
    int end_size;
    do{
        end_size = get_int("End size: ");
    }while(end_size < start_size);
    // TODO: Calculate number of years until we reach threshold
    int year = 0;
    int born = 0;
    int pass = 0;
    while(start_size < end_size){
        born = start_size / 3;
        pass = start_size / 4;
        start_size = start_size + born - pass;
        year++;
    }
    // TODO: Print number of years
    printf("Years:  %i\n",year);
}

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

int main(void)
{
    int height = 0;
    do{
        height = get_int("Height: ");
    }while(height < 1 || height > 8);
    int n = 1;
    for(int i = 0;i < height;i++){
        for(int j = 0;j<height-n;j++){
            printf(" ");
        }
        for(int m=0;m<n;m++){
            printf("#");
        }
        n++;
        printf("\n");
    }
}

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

int main(void)
{
     int height = 0;
    do{
        height = get_int("Height: ");
    }while(height < 1 || height > 8);
    int n = 0;
    for(int i=0;i<height;i++){
        for(int j=0;j<height-n;j++){
            printf(" ");
        }
        for(int m=0;m<n;m++){
            printf("#");
        }
        printf("  ");
        for(int k=0;k<n;k++){
            printf("#");
        }
        n++;
        printf("\n");
    }

}

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

int get_cents(void);
int calculate_quarters(int cents);
int calculate_dimes(int cents);
int calculate_nickels(int cents);
int calculate_pennies(int cents);

int main(void)
{
    // Ask how many cents the customer is owed
    int cents = get_cents();

    // Calculate the number of quarters to give the customer
    int quarters = calculate_quarters(cents);
    cents = cents - quarters * 25;

    // Calculate the number of dimes to give the customer
    int dimes = calculate_dimes(cents);
    cents = cents - dimes * 10;

    // Calculate the number of nickels to give the customer
    int nickels = calculate_nickels(cents);
    cents = cents - nickels * 5;

    // Calculate the number of pennies to give the customer
    int pennies = calculate_pennies(cents);
    cents = cents - pennies * 1;

    // Sum coins
    int coins = quarters + dimes + nickels + pennies;

    // Print total number of coins to give the customer
    printf("%i\n", coins);
}

int get_cents(void)
{
    int cents = 0;
    do{
        cents = get_int("Change owed: ");
    }while(cents < 0);
    // TODO
    return cents;
}

int calculate_quarters(int cents)
{
    // TODO
    return  cents / 25;
}

int calculate_dimes(int cents)
{
    // TODO
    return cents / 10;
}

int calculate_nickels(int cents)
{
    // TODO
    return cents / 5;
}

int calculate_pennies(int cents)
{
    // TODO
    return cents;
}

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


void show_result(long number);

int main(void)
{
    long number = 0;
    do{
        number = get_long("Number: ");
    }while(number<0);
    show_result(number);
}


void show_result(long number){
    int len = 0;
    long count_number = number;
    while(count_number>0){
       len++;
       count_number /=10;
    }
   //printf("lenth:%i\n",len);
   int card[20];
    long sum_number = number;
   // printf("show card\n");
    for(int i=len-1;i>0;i--){
        card[i] = sum_number %10;
        sum_number /= 10;
    }
    card[0] = sum_number;
   /*for(int i=0;i<len;i++){
        printf("%i",card[i]);
    }*/
   // printf("\n");
    int sum = 0;
    for(int i=0;i<len;i+=2){
        card[i]*=2;
        if(card[i]>9){
            sum += card[i] % 10;
            sum += card[i] / 10;
        }
        else{
            sum += card[i];
        }
    }
    for(int i=1;i<len;i+=2){
        sum += card[i];
    }
    if(sum % 10 == 0){
        printf("VISA\n");
    }else{
        printf("INVALID\n");
    }
}