a) printf function It is used to show output on the screen
printf("Hello World!") ;
b) scanf function It is used to take input from the user
scanf("placeholder", variables);
c) Comments A comment is the code that is not executed by the compiler, and the programmer uses it to keep track of the code.
1. Single line comment
// It's a single line comment
2.Multi-line comment
/* It's
a multi-line
comment */
