View difference between Paste ID: HWKWzebh and uQkCQGhz

-// NOTE: compile with g++ filename.cpp -std=c++11
+/*
-//    also, if this doesn't work for you, try the alternate char-based version
+ g++ tweetart.cpp -o tweetart
  Original version: http://pastebin.com/uQkCQGhz
-#include <iostream>
+ Cleaned up version: http://pastebin.com/index/uQkCQGhz
-#include <cmath>
+*/
 #include <stdio.h>
 #include <math.h>
 #include <stdint.h> // uint8_t
 #define DIM 1024
 #define DM1 (DIM-1)
 #define MAX_COLORS 255 // or 255, or 65535
-unsigned short GR(int,int);
+
-unsigned short BL(int,int);
+
 #define _cr(x) (unsigned short)(pow((x),1.0/3.0))  // cube root
-unsigned short RD(int i,int j){
+
-    // YOUR CODE HERE
+typedef uint8_t  u8;
 typedef uint16_t u16;
-unsigned short GR(int i,int j){
+u16 GR(int,int);
-    // YOUR CODE HERE
+u16 BL(int,int);
 
-unsigned short BL(int i,int j){
+u16 RD(int i,int j){
-    // YOUR CODE HERE
+    return (i&j); // YOUR CODE HERE
 }
 u16 GR(int i,int j){
-void pixel_write(int,int);
+    return (i&j); // YOUR CODE HERE
 }
 u16 BL(int i,int j){
-    fp = fopen("MathPic","wb");
+    return (i&j); // YOUR CODE HERE
-    fprintf(fp, "P6\n%d %d\n1023\n", DIM, DIM);
+
 
 FILE *fp;
 void pixel_write(int i, int j){
     static u16 color[3];
     color[0] = RD(i,j) & MAX_COLORS;
     color[1] = GR(i,j) & MAX_COLORS;
     color[2] = BL(i,j) & MAX_COLORS;
-    static unsigned short color[3];
+    if (MAX_COLORS < 256){
-    color[0] = RD(i,j)&DM1;
+        color[0] &= 0xFF;
-    color[1] = GR(i,j)&DM1;
+        color[0] |= ((color[1] & 0xFF) << 8);
-    color[2] = BL(i,j)&DM1;
+        color[1] = color[2];
-    fwrite(color, 2, 3, fp);
+    }
     // 8-bit = 3 bytes
     //16-bit = 6 bytes
     fwrite(color, 1+(MAX_COLORS>255), 3, fp);
 }
 
 int main(){
     fp = fopen("mathpic.ppm","wb");
     if( !fp ) return -1;
     fprintf(fp, "P6\n%d %d\n%d\n", DIM, DIM, MAX_COLORS);
     for(int j=0;j<DIM;j++)
         for(int i=0;i<DIM;i++)
             pixel_write(i,j);
     fclose(fp);
     return 0;
 }