move exercises and lectures into subfolders

Exercises/C7/Scanf1/scanf_example_1.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    int a;		    // Declare some variables
+    float f;
+
+    // Use printf to prompt the use to enter an integer
+    printf ("Please enter an integer\n");
+    
+    // use scanf with %d to read into 'a' 
+    scanf ("%d",&a);	// note the important & 
+    
+    // And display on the screen
+    printf ("The value you entered for a is %d\n", a);
+    
+	// Use printf to prompt the use to enter an float
+    printf ("Please enter a float\n");
+    
+    // use scanf with %f to read into 'f' 
+    scanf ("%f",&f);  // note the important & 
+    
+    // And display on the screen
+    printf ("The value you entered for f is %f\n", f);
+
+    return 0;     // Exit from main
+}