I don't see any error on your code, everything is well written and simple. Except trying putting PUBLIC on your Class displayer. If you encounter the same problem again try to rebuild your whole code and try to recompile the whole code. Even try restarting your personal computer.
Answer:
trackball
Explanation:
A trackball can be seen on a mouse.
Answer:
G=(A^3 + B) * 4-c^2
To calculate G if A=3, b=4 and C=5
cobegin
p1: A^3 = 27
P2:C^2 =25
P3: p1 +B =31
P4:P3*4 =124
P5:P4-P2 =99
coend
Explanation:
One operation is performed at a time, and on the basis of priority as we have only one processor.
Answer:B. Are used to create, organize, and manage databases
Explanation: Database management system (DBMS) is a computer software which is used to collect, analyse or evaluate and retrieve data from a database. It is essential to the flow of businesses or other activities of an organisation.
Examples of database management system softwares MICROSOFT ACCESS,FOXPRO,ORACLE etc all this are effective as it helps to manipulate the data structure,field names,the file formats etc.