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ANSIC << Previous Next >> 練習2

課程2

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

int main() {
    int n, x = 0;

    printf("\n\n Check whether a given number is an ugly number:\n");
    printf("----------------------------------------------------\n");

    // 检查 scanf 的返回值
    if (scanf("%d", &n) != 1) {
        printf("Input is not a valid integer.\n");
        return 1;  // 退出程序，表示出现错误
    }

    if (n <= 0) {
        printf("Input a correct number.\n");
    } else {
        while (n != 1) {
            if (n % 5 == 0) {
                n /= 5;
            } else if (n % 3 == 0) {
                n /= 3;
            } else if (n % 2 == 0) {
                n /= 2;
            } else {
                printf("It is not an ugly number.\n");
                x = 1;
                break;
            }
        }

        if (x == 0) {
            printf("It is an ugly number.\n");
        }
    }

    return 0;
}


#include <stdio.h>
#include <time.h>

int main(void)
{
    time_t epoch = 0;

    printf("\n自纪元开始以来的秒数：%ld\n", (long)epoch);
    printf("对应的日期和时间：%s\n", asctime(gmtime(&epoch)));

    return 0;
}



#define __STDC_WANT_LIB_EXT1__ 1
#include <stdio.h>
#include <time.h>

int main(void)
{
    time_t t = time(NULL);
    printf("\nThe calendar time expressed as a local Time is :");	
    printf("\nUTC:   %s", asctime(gmtime(&t)));
    printf("local: %s\n", asctime(localtime(&t)));

#ifdef __STDC_LIB_EXT1__
    struct tm buf;
    char str[26];

    asctime_s(str, sizeof str, gmtime_s(&t, &buf));
    printf("UTC:   %s", str);

    asctime_s(str, sizeof str, localtime_s(&t, &buf));
    printf("local: %s", str);
#endif

    return 0;
}


#include <stdlib.h>
#include <stdio.h>
#include <time.h>

int main(void)
{
    // 设置时区为“Asia/Calcutta”
    setenv("TZ", "/usr/share/zoneinfo/Asia/Calcutta", 1);   

    // 获取并打印当前日期和时间
    struct tm tm = *localtime(&(time_t){time(NULL)});
    printf("\n今天是 :            %s", asctime(&tm));
    printf("(夏令时 %s)\n", tm.tm_isdst ? "生效中" : "未生效");

    // 将月份减去 24，表示 24 个月前的日期和时间
    tm.tm_mon -= 24;  

    // 重新计算时间
    mktime(&tm);       

    // 获取并打印 24 个月前的日期和时间
    printf("\n24个月前的日期是 : %s", asctime(&tm));
    printf("(夏令时 %s)\n\n", tm.tm_isdst ? "生效中" : "未生效");

    return 0;
}


#include <stdlib.h>
#include <stdio.h>
#include <time.h>

int main(void)
{
    // 设置时区为“Asia/Calcutta”
    setenv("TZ", "/usr/share/zoneinfo/Asia/Calcutta", 1);   

    // 获取并打印当前日期和时间
    struct tm tm = *localtime(&(time_t){time(NULL)});
    printf("\n今天是 :            %s", asctime(&tm));
    printf("(夏令时 %s)\n", tm.tm_isdst ? "生效中" : "未生效");

    // 将月份减去 24，表示 24 个月前的日期和时间
    tm.tm_mon -= 24;  

    // 重新计算时间
    mktime(&tm);       

    // 获取并打印 24 个月前的日期和时间
    printf("\n24个月前的日期是 : %s", asctime(&tm));
    printf("(夏令时 %s)\n\n", tm.tm_isdst ? "生效中" : "未生效");

    return 0;
}


#include <stdio.h>
#include <limits.h>

double powxn(double x, int n) {
    double k;
    if (n == 0) return 1;
    k = powxn(x * x, n / 2);
    if (n % 2) k = k * x;
    return k;
}

int main(void)
{
    double x = 7.0;
    int n = 2;
    printf("\nx = %f, y = %d  ", x, n);
    printf("\nResult:(x^n) : %f ",powxn(x, n));
    x = 6.2;
    n = 3;
    printf("\n\nx = %f, y = %d  ", x, n);
    printf("\nResult:(x^n) : %f ",powxn(x, n));
    return 0;
}

//Source: https://bit.ly/2KNsta8
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

char* fractionToDecimal(int numerator, int denominator) {
    char *p;
    int psz, n, *dec, dsz, x;
    long long num, den, k, f;
    int i, repeat_at;
    int neg = 0;

    psz = dsz = 100; n = x = 0;
    p = malloc(psz * sizeof(char));

    neg = ((numerator > 0 && denominator < 0) ||
           (numerator < 0 && denominator > 0)) ? 1 : 0;
    num = numerator;
    den = denominator;
    num = (num < 0) ? -num : num;
    den = (den < 0) ? -den : den;

    k = num / den;
    f = num % den;

    if (neg && (k || f)) p[n ++] = '-';

    n += sprintf(&p[n], "%lld", k);
    if (!f) {
        p[n] = 0;
        return p;
    }

    p[n ++] = '.';

    dec = malloc(dsz * sizeof(int));

    repeat_at = -1;
    if (f < 0) f = -f;
    while (f) {
        for (i = 0; i < x; i += 2) {
            if (dec[i] == f) {
                repeat_at = i;
                goto done;
            }
        }
        if (x + 1 >= dsz) {
            dsz *= 2;
            dec = realloc(dec, dsz * sizeof(int));
        }
        dec[x ++] = f;
        f *= 10;
        k = f / den;
        dec[x ++] = k;
        f = f % den;
    }

done:
    for (i = 0; i < x; i += 2) {
        if (n + 3 > psz) {
            psz *= 2;
            p = realloc(p, psz * sizeof(char));
        }
        if (repeat_at == i) {
            p[n ++] = '(';
        }
        p[n ++] = '0' + dec[i + 1];
    }
    if (repeat_at != -1) p[n ++] = ')';
    p[n ++] = 0;

    free(dec);

    return p;
}

int main(void)
{
    int n = 3;
    int d = 2;
    printf("\nn = %d, d = %d  ", n, d);
    printf("\nFractional part: %s ", fractionToDecimal(n, d));

    n = 4;
    d = 7;
    printf("\n\nn = %d, d = %d  ", n, d);
    printf("\nFractional part: %s ", fractionToDecimal(n, d));

    return 0;
}


#include <stdio.h>

int main() {
    int fno, sno, *ptr, *qtr, sum;  // 宣告整數變數 fno, sno, sum，以及整數指標 ptr, qtr

    printf("\n\n Pointer : Add two numbers :\n");
    printf("--------------------------------\n");

    printf(" Input the first number : ");
    // 檢查 scanf 的返回值，確保成功讀取一個整數
    if (scanf("%d", &fno) != 1) {
        fprintf(stderr, "Error: Invalid input for the first number.\n");
        return 1;
    }

    printf(" Input the second number : ");
    // 檢查 scanf 的返回值，確保成功讀取一個整數
    if (scanf("%d", &sno) != 1) {
        fprintf(stderr, "Error: Invalid input for the second number.\n");
        return 1;
    }

    ptr = &fno;  // 將 fno 的地址賦值給指標 ptr
    qtr = &sno;  // 將 sno 的地址賦值給指標 qtr

    sum = *ptr + *qtr;  // 解參考 ptr 和 qtr，取得值並計算它們的和

    printf(" The sum of the entered numbers is : %d\n\n", sum);  // 輸出輸入數字的總和

    return 0;
}


#include <stdio.h>

int main() {
    int arr[10];  // 宣告一個大小為10的整數數組，用於存儲使用者輸入的整數
    int i;

    // 提示用戶輸入十個整數
    printf("\n\nRead and Print elements of an array:\n");
    printf("-----------------------------------------\n");
    printf("Input 10 elements in the array :\n");

    // 使用迴圈接受用戶輸入，並將整數存入數組
    for (i = 0; i < 10; i++) {
        printf("element - %d : ", i);

        // 檢查 scanf 的返回值，確保成功讀取一個整數
        if (scanf("%d", &arr[i]) != 1) {
            fprintf(stderr, "Error: Invalid input for element %d.\n", i);
            return 1;  // 如果輸入無效，返回錯誤碼
        }
    }

    // 顯示數組中的所有元素
    printf("\nElements in array are: ");
    for (i = 0; i < 10; i++) {
        printf("%d  ", arr[i]);
    }

    printf("\n");
    return 0;
}


#include <stdio.h>

int main() {
    int days, years, weeks;

    days = 1329; // 總天數

    // 將天數轉換為年、週和天
    years = days / 365;  // 計算年數
    weeks = (days % 365) / 7;  // 計算週數
    days = days % 7;  // 計算剩餘的天數

    // 輸出結果
    printf("Years: %d\n", years);
    printf("Weeks: %d\n", weeks);
    printf("Days: %d\n", days);

    return 0;
}


#include <stdio.h>

int main() {
    double wi1, ci1, wi2, ci2, result; // 宣告變數，用於存儲物品的重量和數量

    // 提示用戶輸入物品1的重量
    printf("Weight - Item1: ");
    if (scanf("%lf", &wi1) != 1) {
        fprintf(stderr, "Error: Invalid input for weight of item1.\n");
        return 1;
    }

    // 提示用戶輸入物品1的數量
    printf("No. of item1: ");
    if (scanf("%lf", &ci1) != 1) {
        fprintf(stderr, "Error: Invalid input for count of item1.\n");
        return 1;
    }

    // 提示用戶輸入物品2的重量
    printf("Weight - Item2: ");
    if (scanf("%lf", &wi2) != 1) {
        fprintf(stderr, "Error: Invalid input for weight of item2.\n");
        return 1;
    }

    // 提示用戶輸入物品2的數量
    printf("No. of item2: ");
    if (scanf("%lf", &ci2) != 1) {
        fprintf(stderr, "Error: Invalid input for count of item2.\n");
        return 1;
    }

    // 計算平均值
    result = ((wi1 * ci1) + (wi2 * ci2)) / (ci1 + ci2);

    // 輸出平均值
    printf("Average Value = %f\n", result);

    return 0;
}


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