View difference between Paste ID: 12quxkA9 and jaV8uTR9

 // NOTE: compile with g++ filename.cpp -std=c++11
 
 #include <iostream>
 #include <cmath>
 #define DIM 1024
 #define DM1 (DIM-1)
 #define _sq(x) ((x)*(x))                           // square
 #define _cb(x) abs((x)*(x)*(x))                    // absolute value of cube
 #define _cr(x) (unsigned char)(pow((x),1.0/3.0))   // cube root
 
-unsigned char green_fn(int,int);
+unsigned char GR(int,int);
-unsigned char blue_fn(int,int);
+unsigned char BL(int,int);
 
-unsigned char red_fn(int i,int j){
+unsigned char RD(int i,int j){
     // YOUR CODE HERE
 }
-unsigned char green_fn(int i,int j){
+unsigned char GR(int i,int j){
     // YOUR CODE HERE
 }
-unsigned char blue_fn(int i,int j){
+unsigned char BL(int i,int j){
     // YOUR CODE HERE
 }
 
 void pixel_write(int,int);
 FILE *fp;
 int main(){
     fp = fopen("MathPic","wb");
     fprintf(fp, "P6\n%d %d\n255\n", DIM, DIM);
     for(int j=0;j<DIM;j++)
         for(int i=0;i<DIM;i++)
             pixel_write(i,j);
     fclose(fp);
     return 0;
 }
 void pixel_write(int i, int j){
     static unsigned char color[3];
-    color[0] =   red_fn(i,j)&255;
+    color[0] = RD(i,j)&255;
-    color[1] = green_fn(i,j)&255;
+    color[1] = GR(i,j)&255;
-    color[2] =  blue_fn(i,j)&255;
+    color[2] = BL(i,j)&255;
     fwrite(color, 1, 3, fp);
 }