1 files changed, 46 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_PRACTICAL_C/10_1.c b/reference/C/CONTRIB/OR_PRACTICAL_C/10_1.c
new file mode 100644
index 0000000..3dac7ad
--- /dev/null
+++ b/reference/C/CONTRIB/OR_PRACTICAL_C/10_1.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+
+#define X_SIZE 40 /* size of array in the X direction */
+#define Y_SIZE 60 /* size of the array in Y direction */
+/*
+ * We use X_SIZE/8 since we pack 8 bits per byte
+ */
+char graphics[X_SIZE / 8][Y_SIZE];   /* the graphics data */
+
+#define SET_BIT(x,y) graphics[(x)/8][y] |= (0x80 >>((x)%8))
+
+main()
+{
+    int   loc;        /* current location we are setting */
+    void  print_graphics(void); /* print the data */
+
+    for (loc = 0; loc < X_SIZE; loc++)
+        SET_BIT(loc, loc);
+
+    print_graphics();
+    return (0);
+}
+/********************************************************
+ * print_graphics -- print the graphics bit array       *
+ *              as a set of X and .'s.                  *
+ ********************************************************/
+void print_graphics(void)
+{
+    int x;     /* current x BYTE */
+    int y;     /* current y location */
+    int bit;   /* bit we are testing in the current byte */
+
+    for (y = 0; y < Y_SIZE; y++) {
+        /* Loop for each byte in the array */
+        for (x = 0; x < X_SIZE / 8; x++) {
+            /* Handle each bit */
+            for (bit = 0x80; bit > 0; bit = (bit >> 1)) {
+                if ((graphics[x][y] & bit) != 0)
+                    (void) printf("X");
+                else
+                    (void) printf(".");
+            }
+        }
+        (void) printf("\n");
+    }
+}