Added book examples

C18/binary_file_example.c

@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+// Main () - execution starts here
+int main (void)
+{
+
+    // Declate file stream variables
+    FILE *fInput, *fOutput;
+
+    // Other variables needed
+    int i;
+    int SampleArray[10] = {1,2,3,4,5,6,7,8,9,10};
+    float f = 23.4;
+
+    // Try and open the binary "numbers.dat" (in the current directory) file for writing
+    fOutput = fopen ("numbers.dat", "wb");
+
+    // Check we were able to open the file
+    if ( fOutput == NULL)
+    {
+        printf ("\nThe file could not be opened for writing, exiting");
+        return -1;
+    }
+
+    // Write out a single float to the binary file
+    fwrite ( &f, sizeof(float), 1 , fOutput);
+
+    // Now the entire array on one go
+    fwrite ( SampleArray, sizeof(int), 10 , fOutput);
+
+    // And close the file
+    fclose (fOutput);
+
+
+    // Try and open the binary "numbers.dat" (in the current directory) file for reading
+    fInput = fopen ("numbers.dat", "rb");
+
+    // Check we were able to open the file
+    if ( fInput== NULL)
+    {
+        printf ("\nthe file could not be opened for reading, exiting");
+        return -1;
+    }
+
+    // Read a single float from the binary file into f
+    fread ( &f, sizeof(float), 1 , fOutput);
+
+    // Now read the entire array on one go
+    fread ( SampleArray, sizeof(int), 10 , fOutput);
+
+    // Display the values read from the file on the screen
+    printf ("The value read into f is %f\n", f);;
+    for ( i = 0 ; i < 10 ; i++)
+    {
+        printf ("Item %d of the array contains %d\n",i, SampleArray[i]);
+    }
+
+    // And close the file
+    fclose (fInput);
+
+
+    return (0);     // Exit indicating sucess
+}

C18/file_open_example.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+// Main () - execution starts here
+int main (void)
+{
+
+    // Declate file stream variables
+    FILE *fInput, *fOutput, *fRecords;
+
+
+    // Try and open the text "sample.txt" (in the current directory) file for reading
+    fInput = fopen ("sample.txt", "r");
+
+    // Check we were able to open the file
+    if ( fInput == NULL)
+    {
+        printf ("\nthe file could not be opened");
+        return -1;	// Exit as unsuccessful 
+    }
+    
+	fclose (fInput);	// Close the file
+
+    // Try and open the binary "samples.dat" (in the current directory) file for writing
+    // if a file of this name already exists it will be deleted
+    fOutput = fopen ("samples.dat", "wb");
+
+    // Check we were able to open the file
+    if ( fOutput == NULL)
+    {
+        printf ("\nthe file could not be opened");
+		return -1;	// Exit as unsuccessful 
+    }
+
+	fclose (fOutput);	// Close the file
+
+    // Open, for appending, the text file "records.txt". If the file does not already
+    // exists, a new one of this name will be created (as if "w") were the mocde
+    fRecords = fopen ("records.txt", "a");
+
+    // Check we were able to open the file
+    if ( fRecords == NULL)
+    {
+        printf ("\nthe file could not be opened");
+		return -1;	// Exit as unsuccessful 
+    }
+
+	fclose (fRecords);
+
+
+    return (0);     // Exit indicating sucess
+}

C18/text_file_example.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+// Main () - execution starts here
+int main (void)
+{
+    // Declate file stream variables
+    FILE *fInput, *fOutput;
+
+    // Other variables needed
+    int i,d;
+
+    // Try and open the text "sample.txt" (in the current directory) file for writing
+    fOutput = fopen ("numbers.txt", "w");
+
+    // Check we were able to open the file
+    if ( fOutput == NULL)
+    {
+        printf ("\nthe file could not be opened for writing, exiting");
+        return -1;
+    }
+
+    // Use a loop to write values to the newly created file
+    for ( i = 1 ; i <= 10 ; i++)
+    {
+        fprintf (fOutput, "%d\n", i);
+    }
+
+    // And close the file
+    fclose (fOutput);
+
+    // Try and open the binary "numbers " (in the current directory) file for reading
+
+    fInput = fopen ("numbers.txt", "r");
+
+    // Check we were able to open the file
+    if ( fInput == NULL)
+    {
+        printf ("\nthe file could not be opened for reading, exiting");
+        return -1;
+    }
+ 
+    // Read, line by line the 10 values written into variable d
+    // and then display the contents of d on the screen
+    for ( i = 1 ; i <= 10 ; i++)
+    {
+        fscanf (fInput, "%d", &d);
+        printf ("Value read from file %d\n",d);
+    }
+
+    // And close the file
+    fclose (fInput);
+
+    return (0);     // Exit indicating success
+}