Why do we use = in C?

Why do we use #include in C?

The #include directive tells the C preprocessor to include the contents of the file specified in the input stream to the compiler and then continue with the rest of the original file.

What is '#' in C language?

'#' is called pre-processor directive and the word after '#' is called pre-processor command. Pre-processor is a program which performs before compilation. Each pre-processing directive must be on its own line.

Why do we use I in C language?

In C programming language, %d and %i are format specifiers as where %d specifies the type of variable as decimal and %i specifies the type as integer. In usage terms, there is no difference in printf() function output while printing a number using %d or %i but using scanf the difference occurs.