computer

• rom is a read only memory
• ram is read and write memory
• rom is nonvolatile
• ascii contains 7 bits
• ebcdic has 8 bits
• a variable in c can only start with an alphabet or an underscore
• runtime error when something is wrong in calculations
• compile time error means a typo
• logical errors are hardest to detect
• cpu is a primary component in the computer
• cache is between processor/cpu and ram
• fetch, decode, execute, store
• to execute a program it has to be loaded in main memory and then it is executed by the CPU
• ocr is an input device converts text to machine readable text
• secondary storage are nonvolatile
• random access devices are hard disks, cd,dvd,ram
• ram and cache are direct access memory
• random access memories are ram,rom and cache memory
• cu is responsible for decoding instructions
• cache memory is the fastest
• network reliability means when one node fails others work
• files are sent using ftp protocol
• test cases are for logical errors
• sequential is a type of logic structure
• fixing bugs is a part of program maintanence
• runtime error like division by 0
• interpreted programs are slower than compiler
• compiled programs need more memory
• device driver enables communication between os and hw
• bootstrap loads os from hardware to memory
• directives are handled by the preprocessor
• switch variable can not be a float
• sdlc stands for software development life cycle
• hardware can not work without device driver
• linux is an open source operating system
• logical operations are executed using electronic components called logiacal gates
• ascii is the most used
• ebcdic is used in IBM
• cathode ray tubes monitor (CRT)
• liquid crystal display