Finished perfect square checks. Now to pretty it

BQ.c

@@ -1,9 +1,9 @@
 #include <stdio.h>
+#include <stdbool.h>
 // Bonus Question
 // All rows, columns, and diagonals are equal
 
-// Matrix MxM
+
-// arr[M] sums * 2 + 2
 // Sum of each row, in arr
 int find_row_sum(const int arr[], int len) {
 	int sum = 0;
@@ -30,6 +30,24 @@ int find_diagonal_sum(const int arr[3][3], int len) {
 	}
 	return sum;
 }
+int find_diagonal_sum_the_other_way(const int arr[3][3], int len) {
+	int sum = 0;
+	int j = len - 1;
+	for(int i = 0; i < len; i++) {
+		sum += arr[i][j];
+		j--;
+	}
+	return sum;
+}
+
+bool is_perfect_square(const int arr[], int len) {
+	bool is_perfect = true;
+	for(int i = 0; i < len - 1 && is_perfect; i++) {
+		if(arr[i] != arr[i+1])
+			is_perfect = false;
+	}
+	return is_perfect;
+}
 
 int main() {
 	// Input will be a set matrix for now
@@ -47,11 +65,13 @@ int main() {
 		}
 	}
 
-    sums[2*M + 1] = find_diagonal_sum(square)
+	sums[2*M] = find_diagonal_sum(square, M);
-
+	sums[2*M+1] = find_diagonal_sum_the_other_way(square, M);
 	for(int i = 0; i < sizeof(sums)/sizeof(sums[0]); i++) {
 		printf("%d ", sums[i]);
 	}
 
+	printf("\n%d", is_perfect_square(sums, M));
+
 	return 0;
 }