Structure of Program

/* This program prints Hello World on screen */ ----------------------------- #include Void main() { printf(''Hello World\n''); } ----------------------------- 1 . /* This program ... */ The symbols/* and*/ used for comment. This Comments are ignored by the compiler, and are used to provide useful information about program to humans who use it. 2. #include This is a preprocessor command which tells compiler to include stdio.h file. 3. main() C programs consist of one or more functions. There must be one and only one function called main. The brackets following the word main indicate that it is a function and not a variable. 4. { } braces surround the body of the function, which may have one or more instructions/statements. 5. printf() it is a library function that is used to print data on the user screen. 6. ''Hello World\n'' is a string that will be displayed on user screen \n is the newline character. ; a semicolon ends a statement. 7. return 0; return the value zero to the Operating system. C is case sensitive language, so the names of the functions must be typed in lower case as above. we can use white spaces, tabs & new line characters to make our code easy to read.