Solve p19 in c, c++

README.rst

@@ -58,12 +58,12 @@ Olivia's Project Euler Solutions
 +------------+----------------------------+--------+-------------------+
 | Language   | Version                    | Solved | Status            |
 +============+============================+========+===================+
-| C          | C99+ in: |clang|, |br|     | 24     | |Ci| |br|         |
+| C          | C99+ in: |clang|, |br|     | 25     | |Ci| |br|         |
 |            | |gcc|, |pcc|, & |tcc| |br| |        | |C-Cov| |br|      |
 |            | C11+ in: |msvc| [1]_       |        | |CodeQL| |br|     |
 |            |                            |        | |C-lint|          |
 +------------+----------------------------+--------+-------------------+
-| C++        | C++98+ in: |br| |clang|, & | 17     | |Cpi| |br|        |
+| C++        | C++98+ in: |br| |clang|, & | 18     | |Cpi| |br|        |
 |            | |gcc| |br|                 |        | |Cp-Cov| |br|     |
 |            | C++14+ in: |msvc| [1]_     |        | |CodeQL| |br|     |
 |            |                            |        | |Cp-lint|         |

c/README.rst

@@ -179,6 +179,8 @@ Problems Solved
 -  ☒ `14 <./src/p0014.c>`__
 -  ☒ `15 <./src/p0015.c>`__
 -  ☒ `16 <./src/p0016.c>`__
+-  ☒ `17 <./src/p0017.c>`__
+-  ☒ `19 <./src/p0019.c>`__
 -  ☒ `20 <./src/p0020.c>`__
 -  ☒ `22 <./src/p0022.c>`__
 -  ☒ `34 <./src/p0034.c>`__

c/src/p0019.c

@@ -0,0 +1,61 @@
+/*
+Project Euler Problem 19
+
+This one ended up being very easy thanks to the time library
+
+Problem:
+
+You are given the following information, but you may prefer to do some research
+for yourself.
+
+    1 Jan 1900 was a Monday.
+    Thirty days has September,
+    April, June and November.
+    All the rest have thirty-one,
+    Saving February alone,
+    Which has twenty-eight, rain or shine.
+    And on leap years, twenty-nine.
+    A leap year occurs on any year evenly divisible by 4, but not on a century
+    unless it is divisible by 400.
+
+How many Sundays fell on the first of the month during the twentieth century
+(1 Jan 1901 to 31 Dec 2000)?
+*/
+#ifndef EULER_P0019
+#define EULER_P0019
+#include <time.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
+
+uint16_t p0019() {
+    uint16_t answer = 0;
+    struct tm date = {0};
+
+    for (int year = 1901; year <= 2000; ++year) {
+        for (int month = 0; month < 12; ++month) {
+            date.tm_year = year - 1900;
+            date.tm_mon = month;
+            date.tm_mday = 1;
+
+            if (mktime(&date) == -1) {
+                fprintf(stderr, "mktime failed to normalize the date.\n");
+                return -1;
+            }
+
+            if (date.tm_wday == 0) {
+                ++answer;
+            }
+        }
+    }
+    return answer;
+}
+
+
+#ifndef UNITY_END
+int main(int argc, char const *argv[]) {
+    printf("%" PRIu16 "\n", p0019());
+    return 0;
+}
+#endif
+#endif

c/test.c

@@ -17,6 +17,7 @@
 #include "src/p0015.c"
 #include "src/p0016.c"
 #include "src/p0017.c"
+#include "src/p0019.c"
 #include "src/p0020.c"
 #include "src/p0022.c"
 #include "src/p0025.c"
@@ -48,6 +49,7 @@ const Answer answers[] = {
 	{15,	137846528820,	p0015},
 	{16,	1366,			p0016},
 	{17,	21124,			p0017},
+	{19,	171,			(uint64_t (*)()) p0019},
 	{20,	648,			p0020},
 	{22,	871198282,		p0022},
 	{25,	4782,			p0025},

c/test_euler.py

@@ -23,7 +23,7 @@
 answers = {
     x: get_answer(x) for x in (
         *range(1, 18),
-        20,
+        *range(19, 21),
         22,
         25,
         30,

cplusplus/src/p0019.cpp

@@ -0,0 +1,59 @@
+/*
+Project Euler Problem 19
+
+This one ended up being very easy thanks to the ctime library
+
+Problem:
+
+You are given the following information, but you may prefer to do some research
+for yourself.
+
+    1 Jan 1900 was a Monday.
+    Thirty days has September,
+    April, June and November.
+    All the rest have thirty-one,
+    Saving February alone,
+    Which has twenty-eight, rain or shine.
+    And on leap years, twenty-nine.
+    A leap year occurs on any year evenly divisible by 4, but not on a century
+    unless it is divisible by 400.
+
+How many Sundays fell on the first of the month during the twentieth century
+(1 Jan 1901 to 31 Dec 2000)?
+*/
+#ifndef EULER_P0019
+#define EULER_P0019
+#include <ctime>
+#include <iostream>
+#include <cstdint>
+#include <stdexcept>
+
+uint16_t p0019() {
+    uint16_t answer = 0;
+    struct tm date = {0};
+
+    for (int year = 1901; year <= 2000; ++year) {
+        for (int month = 0; month < 12; ++month) {
+            date.tm_year = year - 1900;
+            date.tm_mon = month;
+            date.tm_mday = 1;
+
+            if (mktime(&date) == -1) {
+                throw std::runtime_error("mkdtime failed to normalize the date.");
+            }
+            if (date.tm_wday == 0) {
+                ++answer;
+            }
+        }
+    }
+    return answer;
+}
+
+
+#ifndef UNITY_END
+int main(int argc, char const *argv[]) {
+    std::cout << p0019() << std::endl;
+    return 0;
+}
+#endif
+#endif

cplusplus/test.cpp

@@ -17,6 +17,7 @@
 #include "src/p0015.cpp"
 #include "src/p0016.cpp"
 #include "src/p0017.cpp"
+#include "src/p0019.cpp"
 #include "src/p0020.cpp"
 #include "src/p0022.cpp"
 #include "src/p0034.cpp"
@@ -47,6 +48,7 @@ static const Answer answers[] = {
 	{15,	137846528820,	p0015},
 	{16,	1366,			p0016},
 	{17,	21124,			p0017},
+	{19,	171,			(uint64_t (*)()) p0019},
 	{20,	648,			p0020},
 	{22,	871198282,		p0022},
 	{34,	40730,			p0034},

cplusplus/test_euler.py

@@ -30,7 +30,7 @@
         9,
         11,
         *range(13, 18),
-        20,
+        *range(19, 21),
         22,
         34,
         76,

docs/index.rst

@@ -112,7 +112,7 @@ Problems Solved
 +-----------+------------+------------+------------+------------+------------+------------+------------+
 |:prob:`18` |            |            |            |            |            |:py-d:`0018`|:rs-d:`0018`|
 +-----------+------------+------------+------------+------------+------------+------------+------------+
-|:prob:`19` |            |            |            |            |:js-d:`0019`|:py-d:`0019`|:rs-d:`0019`|
+|:prob:`19` |:c-d:`0019` |:cp-d:`0019`|            |            |:js-d:`0019`|:py-d:`0019`|:rs-d:`0019`|
 +-----------+------------+------------+------------+------------+------------+------------+------------+
 |:prob:`20` |:c-d:`0020` |:cp-d:`0020`|:cs-d:`0020`|:ja-d:`0020`|:js-d:`0020`|:py-d:`0020`|:rs-d:`0020`|
 +-----------+------------+------------+------------+------------+------------+------------+------------+

docs/src/c/p0019.rst

@@ -0,0 +1,22 @@
+C Implementation of Problem 19
+==============================
+
+View source code :source:`c/src/p0019.c`
+
+Solution
+--------
+
+.. c:function:: uint16_t p0019()
+
+.. c:function:: int main(int argc, char const *argv[])
+
+   .. note:: 
+      
+      This function is only present in the Python test runner, or when compiling as a standalone program.
+      It is not present when compiling for the Unity test runner.
+
+.. literalinclude:: ../../../c/src/p0019.c
+   :language: C
+   :linenos:
+
+.. tags:: calendar, combinatorics

docs/src/cplusplus/p0019.rst

@@ -0,0 +1,21 @@
+C++ Implementation of Problem 19
+================================
+
+View source code :source:`cplusplus/src/p0019.cpp`
+
+Solution
+--------
+
+.. cpp:function:: uint16_t p0019()
+
+.. cpp:function:: int main(int argc, char const *argv[])
+
+   .. note:: 
+
+      This function is only present in the Python test runner, or when compiling as a standalone program.
+
+.. literalinclude:: ../../../cplusplus/src/p0019.cpp
+   :language: C++
+   :linenos:
+
+.. tags:: calendar, combinatorics

javascript/README.rst

@@ -114,6 +114,7 @@ Problems Solved
 -  ☒ `15 <./src/p0015.js>`__
 -  ☒ `16 <./src/p0016.js>`__
 -  ☒ `17 <./src/p0017.js>`__
+-  ☒ `19 <./src/p0019.js>`__
 -  ☒ `20 <./src/p0020.js>`__
 -  ☒ `22 <./src/p0022.js>`__
 -  ☒ `27 <./src/p0027.js>`__