That's what opcode 'NEG' does on some processors.Can be emulated with a 'NOT' and an 'INC'.
write an assembly language program to find sum of N numbers
How to write the program un Assembly language to set a password for personal computers?
You need an 8086 assembly language pencil.
write program to concatenating two sting in 8086 assembly language
write a program to print A to Z on screen in c?
fish
assembly language uses abbreviation called menmonics.it is a bit easier to write computer programs in assembly language as compared to machine language but still requires skill and experienci.A program called assembler is used to convert an assembly language into machine language.
Either in Assembly or in some high level language/the hex-code (for the mnemonics) that the microprocessor 8085 generally understands.
8086 assembly language program to check wether given number is perfect or not
There isn't a reason to write a complete program to do this; in any assembly language just shift the value 1 bit to the left to double it.
Any text-editor will do.
Unless your particular C implementation allows for direct writing of assembly code, you can't. C is a high-level language and you usually cannot directly issue instructions to the processor. The assembly languages are a set of architecture-specific commands that can be directly executed by a processor.