From 7f93a91a7b47e8f3abae74b3b7865c1817812b20 Mon Sep 17 00:00:00 2001
From: Arkitu <85173315+Arkitu@users.noreply.github.com>
Date: Sun, 5 Oct 2025 19:48:36 +0200
Subject: [PATCH] dm2

---
 dm2/dm2.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 dm2/dm2.c

diff --git a/dm2/dm2.c b/dm2/dm2.c
new file mode 100644
index 0000000..3c09b35
--- /dev/null
+++ b/dm2/dm2.c
@@ -0,0 +1,171 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+double fraction(int a, int b) { return (double)a / (double)b; }
+
+bool bissextile(int year) {
+    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
+}
+
+double evalue(double coef[], int size, double x) {
+    double res = 0;
+    while (size > 0) {
+        size -= 1;
+        res *= x;
+        res += coef[size];
+    }
+    return res;
+}
+
+int ecartmin(int t[], int size) {
+    int min = abs(t[size - 1] - t[size - 2]);
+    while (size > 2) {
+        size -= 1;
+        int ecart = abs(t[size - 1] - t[size - 2]);
+        if (ecart < min) {
+            min = ecart;
+        }
+    }
+    return min;
+}
+
+// Returns 0 if no integer has been detected
+int extraire(char str[]) {
+    while (*str != '-' && (*str <= '0' || *str >= '9')) {
+        if (*str == 0) {
+            return 0;
+        }
+        str += 1;
+    }
+
+    int signe = 1 - (2 * (*str == '-'));
+    str += *str == '-';
+
+    int res = 0;
+    while (*str >= '0' && *str <= '9') {
+        res *= 10;
+        res += *str - '0';
+        str += 1;
+    }
+    return res * signe;
+}
+
+double sommemajo(double t[], int size) {
+    int signe = 0;
+    double pos = 0.;
+    double neg = 0.;
+    while (size > 0) {
+        size -= 1;
+        double x = t[size];
+        if (x > 0) {
+            signe += 1;
+            pos += x;
+        } else if (x < 0) {
+            signe -= 1;
+            neg += x;
+        }
+    }
+    return (pos * (signe > 0)) + (neg * (signe < 0));
+}
+
+// Only works with ASCII
+int nbdiff(char str[]) {
+    int chars[126] = {0};
+    while (*str) {
+        chars[*str - 1] += 1;
+        str += 1;
+    }
+    int count = 0;
+    char c = 1;
+    while (c < 126) {
+        count += chars[c] > 0;
+        c += 1;
+    }
+    return count;
+}
+
+bool palindromeint(int a) {
+    int temp = a;
+    int rev = 0;
+    while (temp) {
+        rev *= 10;
+        rev += temp % 10;
+        temp /= 10;
+    }
+    return a == rev;
+}
+
+// Only works with alphabetical strings
+bool palindrome2(char str[]) {
+    int size = strlen(str);
+    while (size > 1) {
+        char c1 = *str;
+        c1 += ('a' - 'A') * (c1 <= 'Z');
+        char c2 = str[size - 1];
+        c2 += ('a' - 'A') * (c2 <= 'Z');
+        if (c1 != c2) {
+            return false;
+        }
+        str += 1;
+        size -= 2;
+    }
+    return true;
+}
+
+int sommeentiers(char str[]) {
+    int count = 0;
+    while (true) {
+        while (*str != '-' && (*str <= '0' || *str >= '9')) {
+            if (*str == 0) {
+                return count;
+            }
+            str += 1;
+        }
+
+        int signe = 1 - (2 * (*str == '-'));
+        str += *str == '-';
+
+        int res = 0;
+        while (*str >= '0' && *str <= '9') {
+            res *= 10;
+            res += *str - '0';
+            str += 1;
+        }
+        count += signe * res;
+    }
+}
+
+int main() {
+    printf("-2/3 = %f\n\n", fraction(-2, 3));
+
+    printf("2004 %s bissextile\n", bissextile(2004) ? "est" : "n'est pas");
+    printf("2100 %s bissextile\n\n", bissextile(2100) ? "est" : "n'est pas");
+
+    printf("Avec x=-3.716309026, 2.5x² - 2x + 0.04=%f\n\n",
+           evalue((double[3]){0.04, -2., 2.5}, 3, -3.716309026));
+
+    printf("min([2, 5, 89, 3]) = %d\n\n", ecartmin((int[4]){2, 5, 89, 3}, 4));
+
+    printf("Le premier nombre dans \"eia42snt-134eius34)\" est %d\n\n",
+           extraire("eia42snt-134eius34)"));
+
+    printf("sommemajo([80, -2, -1])=%f\n\n",
+           sommemajo((double[3]){80., -2., -1.}, 3));
+
+    printf("\"eia42snt-134eius34)\" a %d caractères différents\n\n",
+           nbdiff("eia42snt-134eius34)"));
+
+    printf("42 %s un palindrome\n", palindromeint(42) ? "est" : "n'est pas");
+    printf("123454321 %s un palindrome\n\n",
+           palindromeint(123454321) ? "est" : "n'est pas");
+
+    printf("\"eiasnteius\" %s un palindrome\n",
+           palindrome2("eiasnteius") ? "est" : "n'est pas");
+    printf("\"Kayak\" %s un palindrome\n\n",
+           palindrome2("Kayak") ? "est" : "n'est pas");
+
+    printf("La somme des entiers dans \"eia42snt-134eius34)\" est %d\n",
+           sommeentiers("eia42snt-134eius34)"));
+}
\ No newline at end of file