Testing
Category: Uncategorized
ဒီ တစ္ေခါက္ေက်ာင္းဖြင့္ေတာ့ အတန္းတစ္ခုမွာ RPN (Reverse Polish Notation) Calculator Programing ေလးကို ေရးခိုင္းတယ္။ လြယ္လြယ္ေလးေတာ့ လြယ္လြယ္ေလးပဲ။ ဒါေပမဲ့ လြယ္တင္ထင္ၿပီး မလုပ္ဘဲထားလိုက္တာ အနားေရာက္ေတာ့မွ တစ္ခုက တစ္ေနလို႔ အေတာ္ေရးယူလိုက္ရတယ္။ ၿပီးေတာ့ လုပ္ရခက္တဲ့ အေၾကာင္းရင္းက Project ကို Data Design လုပ္တာ နည္းနည္းမွားသြားတယ္။ ပိုေကာင္းတဲ့ Design ကို Due ခါနီးမွပဲ စဥ္းစားမိတယ္။ အခုက Unary Prefix Operator ျဖစ္တဲ့ Minus Number ေတြကို တြက္လို႔မရေသးဘူး။ Unary Operator ဆိုတာ 2 + -2 လိုမ်ိဳးမွာ – က Unary Operator ပါ။ အခုအတြက္ လိုအပ္တဲ့ Data Structure ကိုေတာ့ Stack နဲ့ Queue ႏွစ္ခုနဲ့ သံုးထားပါတယ္။ Stack နဲ႔ Queue ဟာ Linked List ကေန Inherit လုပ္ထားတဲ့ Special Requirement Data Structure ႏွစ္ခုျဖစ္ပါတယ္။ Stack, Queue, Linked List ေတြအကုန္လံုး Java မွာ Native ပါေပမဲ့ အဲဒါေတြကိုလည္း ကိုယ္တိုင္ျပန္ေရးထားပါတယ္။ Linked List အမ်ိဳးအစားေတြကေတာ့ အမ်ားႀကီးရွိေပမဲ့ Singular Linked List ကိုပဲသံုးထားပါတယ္။
ေနာက္က်မဲ့ လိုအပ္တဲ့ Algorithm ေတြကို ေသခ်ာေရဦးမယ္။ ဒီမွာ အဓိကလုပ္တာကေတာ့ Infix လို႔ေခၚတဲ့ Math Expression တစ္ခုကို User ကေပးလိုက္ရင္ Parse လုပ္ၿပီး Evaluate လုပ္တာပါ။ Program က Unary Postfix Operator ကလြဲရင္ Expression ေတာ္ေတာ္မ်ားမ်ားကို Parse လုပ္ႏိုင္ေပမဲ့ Evaluate လုပ္ရင္ အဆင္မေျပေသးပါဘူး။ ကြန္ပ်ဴတာေတြ Calculator ေတြမွာ အလုပ္လုပ္ရင္ Postfix သို႔ Prefix လို႔ေခၚတဲ့ Expression ကို Internally ေျပာင္းၿပီး တြက္ခ်က္ပါတယ္။ အဲဒါက Machine ေတြအတြက္ပိုၿပီး Memory Space, Processing Cycle Efficient ျဖစ္ပါတယ္။ ေနာက္ၿပီးေတာ့ Evaluate လုပ္တဲ့အခါမွာ ေရးရတဲ့ Developer အတြက္လည္း ပိုၿပီးေတာ့ Complexity ေလွ်ာ့နည္းပါတယ္။
Example Infix Expression – 2 + – 2 * 4
Ladder
Zipper
Double Back
Loop Back
Sawtooth
Footbag
Hash
Twistie
Hidden Knot
Riding Bow
Checkerboard
Lattice
Bi-Color
Well, no one knows I’m a sci hardcore. I like all sorts of Sci-fi movies and tv shows. Yeah!!! I sometimes try to enjoy low budget ones. 
This is the song from Star Trek Enterprise, which turns out to be one of my most favorite songs. I just happened to listen it again while I was shuffling my iPod. This song gives me an energy in someway whenever I listen to it. Might I call it a “Faith of My Trust in Science?”
Star Trek Enterprise Welcome Screen
It’s been a long road getting from there to here
It’s been a long time, but my time is finally near
and I can feel the change in the wind right now
Nothing’s in my way
and they’re not gonna hold me down no more
No they’re not gonna hold me down
Cause I’ve got faith of the heart I’m going where my heart will take me
I’ve got faith to believe I can do anything
I’ve got strength of the soul and no one’s gonna bend or break me
I can reach any star, I’ve got faith, I’ve got I’ve got I’ve got faith… faith of the heart
It’s been a long night trying to find my way
Been through the darkness, now I’ve finally had my day
and I will see my dream come alive at last I will touch the sky
And they’re not gonna hold me down no more no they’re not gonna change my mind
Cause I’ve got faith of the heart I’m going where my heart will take me
I’ve got faith to believe I can do anything
I’ve got strength of the soul and no one’s gonna bend or break me
I can reach any star, I’ve got faith, I’ve got I’ve got I’ve got faith… faith of the heart
I’m going where the winds so cold, to see the darkest days
But now the winds are free…only winds have changed
I’ve been to the fire and I’ve been to the rain
But I’ll be fine cause I’ve got faith… faith of the heart
Cause I’ve got faith of the heart I’m going where my heart will take me
I’ve got faith to believe I can do anything
I’ve got strength of the soul and no one’s gonna bend or break me
I can reach any star, I’ve got , I’ve got I’ve got I’ve got faith….faith of the heart
faith of the heart I’m going where my heart will take me
I’ve got faith to believe and no one’s gonna bend or break
I can reach any star, cause I’ve got faith, cause I’ve got faith, faith of the heart
