Completed

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

archives/5/src/main.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include "utils.h"
+
+/*
+2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.
+
+What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
+
+https://projecteuler.net/problem=5
+*/
+int main(int argc,char**argv) {
+    int numb=1;
+    while (true) {
+        boolean isDivisible=true;
+        for (int i=1;i<=20;i++) {
+            if (numb%i!=0) {
+                isDivisible=false;
+                break;
+            }
+        }
+        if (isDivisible) {
+            printf("%d is divisible!",numb);
+            break;
+        } else {
+            numb++;
+        }
+    }
+    return 0;
+}

archives/5/src/utils.h

@@ -0,0 +1,7 @@
+#define true 1
+#define false 0
+#define boolean char
+struct String{
+    int length;
+    char*str;
+};

src/main.c

@@ -2,65 +2,28 @@
 #include "utils.h"
 
 /*
-A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.
+2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.
 
-Find the largest palindrome made from the product of two 3-digit numbers.
+What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
 
-https://projecteuler.net/problem=4
+https://projecteuler.net/problem=5
 */
-
-struct String numberToString(int numb) {
-    int placeValues=0;
-    int tempNumb=numb;
-    while (tempNumb>0) {
-        tempNumb/=10;
-        placeValues++;
-    }
-    char*finalStr=malloc(placeValues+1);
-    tempNumb=numb;
-    int marker=placeValues-1;
-    while (tempNumb>0) {
-        finalStr[marker--]='0'+(tempNumb%10);
-        tempNumb/=10;
-    }
-    struct String str={placeValues,finalStr};
-    return str;
-}
-
-boolean isPalindrome(struct String numb) {
-    int offset=0;
-    while (offset<numb.length/2) {
-        //printf("Compare %c to %c\n",numb.str[offset],numb.str[numb.length-offset-1]);
-        if (numb.str[offset]!=numb.str[numb.length-offset-1]) {
-            return false;
-        }
-        offset++;
-    }
-    return true;
-}
-
 int main(int argc,char**argv) {
-    int numb1=999;
-    int numb2=999;
-    int maxPal=0;
-
-    //printf("%s : %d",numberToString(numb1*numb2).str,numberToString(numb1*numb2).length);
-
-    for (numb1=999;numb1>0;numb1--) {
-        for (numb2=999;numb2>0;numb2--) {
-            struct String str = numberToString(numb1*numb2);
-            if (isPalindrome(str)) {
-                printf("%d is a Palindrome!\n",numb1*numb2);
-                if (maxPal<numb1*numb2) {
-                    maxPal=numb1*numb2;
-                    printf("  New MAX set to %d\n",maxPal);
-                }
+    int numb=1;
+    while (true) {
+        boolean isDivisible=true;
+        for (int i=1;i<=20;i++) {
+            if (numb%i!=0) {
+                isDivisible=false;
+                break;
             }
-            free(str.str);
+        }
+        if (isDivisible) {
+            printf("%d is divisible!",numb);
+            break;
+        } else {
+            numb++;
         }
     }
-
-    printf("\n\nThe maximum palindrome is %d\n",maxPal);
-
     return 0;
 }