move exercises, lecture examples, labs into subfolders

Exercises/C18/ex4.c

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+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+
+float degrees_to_radians(float degrees) {
+	return M_PI * degrees / 180.0;
+}
+
+
+// Simple function to populate an integer array
+void PopulateTheArray ( int Size, float ArrayData[])
+{
+    int i;      // Variable to use in our loop
+
+    for ( i = 0 ; i < Size ; i++)
+    {
+        ArrayData[i] = degrees_to_radians(i); // Treat it like a normal array
+    }
+}
+// Simple function do display contents an integer array
+void DisplayTheArray ( int Size, float ArrayData[])
+{
+    int i;      // Variable to use in our loop
+
+    for ( i = 0 ; i < Size ; i++)
+    {
+        printf ("%d\t%0.3f\n", i, ArrayData[i]);
+    }
+}
+
+int SaveArray (char *filename, int Size, float ArrayData[])
+{
+	FILE *fp;   // File Pointer
+	int i;      // Variable to use in our loop
+
+	fp = fopen(filename, "w");
+	// if file open failed, return error to caller
+	if (fp == NULL) {
+		return 1;
+	}
+
+
+	for ( i = 0 ; i < Size ; i++)
+	{
+		fprintf(fp, "%d\t%0.3f\n", i, ArrayData[i]);
+	}
+
+	// close file, returns 0 on successful closing (therefore function has executed sucessfully)
+	return fclose(fp);
+}
+// Main () - execution starts here
+int main (void)
+{
+    char filename[2049];
+    int rc, iSizeForArray;
+    float *pData;              // A pointer to hold the base address of out array
+
+    // Ask for the size of the array and store result
+
+    printf("Please enter the size of the array to dynamically allocate: ");
+    scanf ("%d", &iSizeForArray);
+
+    // Use calloc with checking
+    pData = calloc( iSizeForArray, sizeof (float));
+
+    // Check we got the memory
+    if ( pData == NULL)
+    {
+        printf ("Sorry, I could not allocate the memory, bye!\n");
+        return -1;
+    }
+
+    // Pass the size, iSizeForArray) and the pointer created 
+    // which points to the start of the sucesfully allocated memory
+
+    PopulateTheArray(iSizeForArray, pData);
+    DisplayTheArray(iSizeForArray, pData);
+
+    // Exercise doesn't ask to use function but kind of pointless without
+    printf("Enter filename: ");
+    scanf("%2048s", filename);
+    rc = SaveArray(filename, iSizeForArray, pData);
+    if (rc != 0) {
+	    printf("Error saving file\n");
+	    free(pData);
+	    return rc;
+    }
+
+    free(pData);	    // Free up the memory before exiting
+    return (0);     // Exit indicating sucess
+}