I am trying to set java path on my windows 8.1, and i installed jdk 8u 64 bit and in environmental variables under system variables there is no PATH found,so i incuded new path variable to set path for jdk and jre ,by copying the bin path of jdk C:\Program Files (x86)\Java\jdk1.8.0\_40\bin and i appended jre path C:\Program Files (x86)\Java\jre1.8.0\_40,but it doesnt work when i tried in command prompt by typing "java -version"
and "javac" it says that java is not a internal or external command. and i had a doubt that to run java through command prompt ,do we need any other installations like turbo c  

please help me out to set path in my pc,i am a begginer of java

thank you