Merge branch 'primzahl' into 'master'

Merge branch 'primzahl' into 'master'

See merge request fdai8031/cstools101!11

src/primzahl/main.c

@@ -0,0 +1,19 @@
+#include "primzahl.h"
+#include "../userinput.h"
+#include <stdio.h>
+
+int main() {
+    // set the smallest possible input
+    int minInput = 0;
+
+    //get user input
+    int num = usergetd("Enter a positive number: ", minInput, NULL);
+
+    //check if its a prime number or not
+    if (primzahl(num))
+        printf("%d is a prime number.\n", num);
+    else
+        printf("%d is not a prime number.\n", num);
+
+    return 0;
+}

src/primzahl/primzahl.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int primzahl(int num) {
+	//for the case zero or one
+	if (num <= 1)
+		return 0;
+
+	//checking if there are any other divider
+	for (int i = 2; i < num; i++) {
+		if (num % i == 0)
+			return 0;
+	}
+	//if none were found return true
+	return 1;
+}

src/primzahl/primzahl.h

@@ -0,0 +1,6 @@
+#ifndef PRIMZAHL_H
+#define PRIMZAHL_H
+
+int primzahl(int num);
+
+#endif

test/primzahl/test_primzahl.c

@@ -0,0 +1,17 @@
+#include "unity.h"
+#include "primzahl.h"
+
+void setUP(){}
+void tearDown(){}
+
+void test_primzahl() {
+	TEST_ASSERT_TRUE(primzahl(2));	// 2 is a prime number
+	TEST_ASSERT_TRUE(primzahl(3));	// 3 is a prime number
+	TEST_ASSERT_TRUE(primzahl(5));	// 5 is a prime number
+	TEST_ASSERT_TRUE(primzahl(7));	// 7 is a prime number
+	TEST_ASSERT_FALSE(primzahl(1));	// 1 is not a prime number
+	TEST_ASSERT_FALSE(primzahl(4));	// 4 is not a prime number
+	TEST_ASSERT_FALSE(primzahl(6));	// 6 is not a prime number
+	TEST_ASSERT_FALSE(primzahl(9));	// 9 is not a prime number
+
+}