11.29 Lab7

introduction-to-computer-science-laboratory-7.pdf

Finish the first 4 exercises present in the 7th tutorial.

Write a C program that takes a year from standard input and determines if is leap or not. A year is leap when is a multiple of 4, except for years divisible by 100 but not by 400.

#include <stdio.h>

int main() {
    int year;
    scanf("%d", &year);
    if(((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0))
        printf("Yes, this is a leap!!!");
    else 
        printf("No, this is not a leap!!!");
    return 0;
}

Write a C program that given 2 dates calculates how many days are between them.

#include <stdio.h>

//determine how many days do the month have
int jiyue(int month) {
    if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)
        return 1;
    else if (month == 4 || month == 6 || month == 9 || month == 11)
        return 0;
    else
        return 2;
}
//determine whether a year is a leap year or not
int jinian(int year) {
    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
        return 1; 
    else
        return 0;
}

int main() {
    int year1, month1, day1, year2, month2, day2;
    int interval = 0; //the days between two dates
    printf("Please enter two dates, the form is: \"xxxx.xx.xx-xxxx.xx.xx\"\n");
    scanf("%d.%d.%d-%d.%d.%d", &year1, &month1, &day1, &year2, &month2, &day2);

    // Calculate the first year remaining days
    for (int i = 12; i >= month1; i--) {
        if (jiyue(i) == 1)
            interval += 31;
        else if (jiyue(i) == 0)
            interval += 30;
        else {
            if (jinian(year1) == 1)
                interval += 29;
            else
                interval += 28;
        }
    }

    // Calculate the last year remaining days
    for (int j = 1; j < month2; j++) {
        if (jiyue(j) == 1)
            interval += 31;
        else if (jiyue(j) == 0)
            interval += 30;
        else {
            if (jinian(year2) == 1)
                interval += 29;
            else
                interval += 28;
        }
    }

    // Calculate the days of interval years
    for (int k = year1 + 1; k <= year2 - 1; k++) {
        if (jinian(k) == 1)
            interval += 366;
        else
            interval += 365;
    }

    if (year1 != year2)
        printf("%d", interval - day1 + day2);
    else
        printf("%d", interval - day1 + day2 - (jinian(year1) ? 366 : 365));

    return 0;
}

Write a C program that receives as an input a sequence of characters and counts the vowels letters and the consonant letters in said sequence.

#include <stdio.h>

int determine(char cha) {
    if(cha == 'a' || cha == 'e' || cha == 'i' || cha == 'o' || cha == 'u' ) 
        return 1;
}

int main() {
    char ch;
    int sumv = 0;
    int sumc = 0;
    while(ch != EOF) {
        ch = getchar();
        if(ch >= 'A' && ch <= 'z') {
            if(determine(ch) == 1) {
                sumv += 1;
            } 
            else {
                sumc += 1;
            }
        }
    }
    printf("the vowels letters: %d\nthe consonant letters: %d\n", sumv, sumc);
    return 0;
}

Write a C program that takes as input a sequence of characters and highlights in bold all the words that start with a vowel.

#include<stdio.h>

#define red "\e[31m"
#define off "\e[39m"

//determine whethere it is a vowel
int determine(char cha) {
    if(cha == 'a' || cha == 'e' || cha == 'i' || cha == 'o' || cha == 'u' ) 
        return 1;
}

int main() {
    char ch;
    char ch_old = ' ';
    ch = getchar();
    while(ch != EOF) {
        if(ch != ' ' && ch_old == ' ') {
            if(determine(ch) == 1)
                printf("%s%c", red, ch);
            else 
                printf("%s%c", off, ch);
        }
        else 
            putchar(ch);
        ch_old = ch;
        ch = getchar();
    }
    printf("%s", off);
    return 0;
}

Write a program that takes as input a sequence of integer numbers and prints the third greatest number.

#include<stdio.h>

int main() {
    int max, min, mid, input, max_temp, min_temp, mid_temp;
    printf("Please enter a sequence of numbers and enter non-number to end\n");
    scanf("%d", &input);
    min = -2147483648;
    mid = input;
    max = +2147483648;
    while(scanf("%d", &input) == 1) {
        min_temp = min;
        max_temp = max;
        mid_temp = mid;
        if(input > max) {
            max = input;
            mid = max_temp;
            min = mid_temp;
        }
        else if(input > min && input < max) {
            max = max;
            mid = input;
            min = mid_temp;
        }
    }
    printf("The third greatest number is %d", min);
}

Write a C program that, given a sequence of integer numbers determines if the sequence is ordered in ascending order or not.

#include<stdio.h>

int main() {
    int new_number, old_number;
    int flag = 1;
    scanf("%d", &new_number);
    old_number = new_number;
    while(flag == 1 && scanf("%d", &new_number) == 1 ) {
        if(new_number < old_number) {
            printf("No, this is not a ascending order!!!");
            flag = 0;
        }
        old_number = new_number;
    }
    return 0;
}

Write a C program that takes as input a number k from 0 to 100 and a sequence of characters. Then prints the sequence with all characters shifted k positions forwards in the ASCII table. e.g. for the sequence "Hello" and the key 3, the result should be "Khoor".

#include<stdio.h>

int main() {
    int k;
    int ch;
    printf("Please enter a number k to shift k positions forwards in the ASCII table\n");
    scanf("%d", &k);
    printf("Please enter some words\n");
    while(ch != EOF) {
        ch = getchar();
        printf("%c", ch + k);
    }
    return 0;
}

Write a C program that takes as input a number k from 0 to 100 and a sequence of characters. Then prints the sequence with all characters shifted k positions backwards in the ASCII table. e.g. for the sequence "Khoor" and the key 3, the result should be "Hello".

#include<stdio.h>

int main() {
    int k;
    int ch;
    printf("Please enter a number k to shift k positions backwards in the ASCII table\n");
    scanf("%d", &k);
    printf("Please enter some words\n");
    while(ch != EOF) {
        ch = getchar();
        printf("%c", ch - k);
    }
    return 0;
}