CEX_t <<
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ANSIC
1
#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;
}
2
#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;
}
3
#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;
}
4
#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;
}
5
#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;
}
6
//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;
}
7
#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;
}
8
#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;
}
9
#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;
}
10
#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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