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

archives/6/src/main.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include "utils.h"
+
+/*
+The sum of the squares of the first ten natural numbers is,
+
+The square of the sum of the first ten natural numbers is,
+
+Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is .
+
+Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
+
+https://projecteuler.net/problem=6
+*/
+int main(int argc,char**argv) {
+    int sumOfSquares=0,squareOfSum=0;
+    for (int i=0;i<=100;i++) {
+        sumOfSquares+=i*i;
+    }
+    for (int i=0;i<=100;i++) {
+        squareOfSum+=i;
+    }
+    squareOfSum*=squareOfSum;
+    printf("%d - %d = %d",squareOfSum,sumOfSquares,squareOfSum-sumOfSquares);
+    return 0;
+}

archives/6/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

@@ -2,28 +2,25 @@
 #include "utils.h"
 
 /*
-2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.
+The sum of the squares of the first ten natural numbers is,
 
-What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
+The square of the sum of the first ten natural numbers is,
 
-https://projecteuler.net/problem=5
+Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is .
+
+Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.
+
+https://projecteuler.net/problem=6
 */
 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++;
+    int sumOfSquares=0,squareOfSum=0;
+    for (int i=0;i<=100;i++) {
+        sumOfSquares+=i*i;
     }
+    for (int i=0;i<=100;i++) {
+        squareOfSum+=i;
     }
+    squareOfSum*=squareOfSum;
+    printf("%d - %d = %d",squareOfSum,sumOfSquares,squareOfSum-sumOfSquares);
     return 0;
 }