Added book examples

C4/correct_answer.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // Declare and initialise as required
+    int a = 1,b = 4;
+    float ans;
+
+    // Perform calculation 
+    // This time a & b are  treated as if they are floats
+    // the result of this float calculation is stored in ans
+    ans = (float)a / (float)b;
+
+    // Display answer
+    printf ("\nThe answer is %f",ans);
+
+    return 0;
+
+}

C4/declare_a_string.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main(void)
+{
+	// A variable to store a name (maximum 49 characters)
+	char Name[50];
+    
+	// Declare multiple strings on the same line 
+	char AddressLine1[100], AddressLine2[100], PostCode[10];
+
+	// all done
+	return 0;
+}

C4/difficult_to_read_code.c

@@ -0,0 +1,4 @@
+#include <stdio.h>
+int main(void) { int revenue = 80; int cost = 50; int roi; 
+roi = (100 * (revenue - cost)) / cost; if (roi >= 0) { 
+printf ("%d\n", roi); } return 0; }

C4/poor_layout.c

@@ -0,0 +1,4 @@
+#include <stdio.h>
+
+ /* My first program */
+int main(void) { printf("Hello World");  return 0; }

C4/reformatted_code.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+int main(void) 
+{
+	// Declare variables and give initial values 
+	int revenue = 80;
+	int cost = 50;
+	int roi;
+	
+	// Perform calculation
+	roi = (100 * (revenue - cost)) / cost;
+	
+	// Make decision based on value of roi
+	if (roi >= 0) 
+	{
+		printf ("%d\n", roi);
+	}
+
+	return 0;	// Exit indicating success
+}

C4/simple_claculation.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+#include <stdlib.h>
+int main(void)
+{
+    int a = 6,b = 7,c; // Declare and initialiase as required
+    c = a + b;         // Add the values and store in c
+
+}

C4/well_laid_out_code.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+/* My first program */
+int main(void)
+{
+  printf("Hello World");
+  return 0;
+}

C4/wrong_answer.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void)
+{
+    // Declare and initialiase as required
+    int a = 1,b = 4;
+    float ans;
+
+    ans = a / b;	    // Perform calculation
+
+    // Display answer
+    printf ("\nThe answer is %f",ans);
+    
+    // Exit from program
+    return 0;
+}