rename directory

10_summation_of_primes/main.go

@@ -0,0 +1,40 @@
+package main
+
+import "fmt"
+
+func main() {
+	sum := 0
+	from := 2
+	count := 0
+	for {
+		if from == 2000000 {
+			break
+		}
+		if IsPrime(from) {
+			fmt.Println("prime:", from)
+			sum += from
+			count++
+		}
+		from++
+	}
+	fmt.Println("sum:", sum, count)
+}
+
+func IsPrime(n int) bool {
+	if n < 2 {
+		return false
+	}
+	if n == 2 {
+		return true
+	}
+	squareRoot := 1
+	for squareRoot*squareRoot < n {
+		squareRoot++
+	}
+	for i := 2; i <= squareRoot; i++ {
+		if n%i == 0 {
+			return false
+		}
+	}
+	return true
+}