Add number input.

io/myio.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include "myio.h"
+
+unsigned char getSingleChar()
+{
+    unsigned char result = 'a';
+
+    result = getchar();
+    while(result != '\n' && getchar() != '\n') {}
+
+    return result;
+}
+
+int getNumber(const char *text)
+{
+    int number = 0;
+    int wasSuccessful = 0;
+
+    do
+    {
+        printf("%s", text);
+        wasSuccessful = scanf("%d", &number);
+        while(getchar() != '\n') {} 
+    } while(!wasSuccessful);
+
+    return number;
+}

io/myio.h

@@ -0,0 +1,7 @@
+#ifndef MYIO_H
+#define MYIO_H
+
+unsigned char getSingleChar();
+int getNumber(const char *text);
+
+#endif

io/testInput.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include "../io/myio.h"
+
+int main()
+{
+    int number = getNumber("Geben Sie eine Zahl ein: ");
+
+    printf("number: %d\n", number);
+
+    return 0;
+}