What is a compiler?

• Assembler is a program that converts assembly level language (low level language) into machine level language.
• Compiler compiles entire C source code into machine code. Whereas, interpreters converts source code into intermediate code and then this intermediate code is executed line by line.

• printf() is an inbuilt library function in C which is available in C library by default. This function is declared and related macros are defined in “stdio.h” header file.
• printf() function is used to print the “character, string, float, integer, octal and hexadecimal values” onto the output screen.

• scanf() function is an inbuilt library function in C which is available in C library by default. This function is declared and related macros are defined in “stdio.h” header file.
• scanf() function is used to read character, string, numeric data from keyboard.

• The protocol is nothing but a set of rules to be followed by a programmer.

Always, execution of a C program starts from main() function.

• IDE is nothing but Integrated Development Environment. IDE is a tool that provides user interface with compilers to create, compile and execute C programs.
• Example: Turbo C++, Borland C++ and DevC++. These provide Integrated Development Environment with compiler for both C and C++ programming language.

• There are so many compilers available in market for Windows operating system and UNIX. We are listing some of them here for your reference.

  • AMPC
  • CCS C Compiler
  • ch
  • clang
  • Cygwin
  • Digital mars
  • GCC compiler
  • MikroC Compiler
  • Portable C Compiler, Power C, QuickC, Ritchie C Compiler, Small-C

Yes. C language instructions/commands/functions and everything used in C program are case sensitive.