C TUTORIAL 4.

decision making instruction:

C TUTORIAL 3.

starting programing in C

C TUTORIAL 2.

OPERATORS IN C

LIBRARY IN C

WHAT IS LIBRARY IN C:

A library is collection of in built functions to perform various operations.They are grouped together as a single unit for re-usability.

If the programmer wishes to use a function contained in library,they only need to specify the function name,following the function prototype i.e, correct call or return condition.Program must #include statement at the beginning of the program.This is known as a header file.The compiler will then internally link the standard library code by default.

SOME COMMONLY USED HEADER FILES ARE:

stdio.h - for file input and output operation

string.h - for string operation

time.h - for manipulating date and time

stdlib.h - for memory management utility functions like calloc() and malloc().

C TUTORIAL 1.

C fundamentals and preview

RAGGED ARRARY

The two-dimensional array character type arrays occupy a fixed amount of memory space for each row that is rarely needed .Therefore , instead of making each row fixed number of characters . We can make it a pointer to a string of varying length.

The character Arrays with the rows of varying length are called "RAGGED ARRAY " and are better handled by pointer . For example :

char *cname[3] = {"india", "nepal" ,"bhutan"}; // is the declaration and intialisation of Ragged Array.

FILE

COMMAND LINE ARGUMENT :- Command line argument is parameter supplied to a program when the program is invoked . This parameter may represent a File name the program should process . In fact main() can take two argument (from the operating system) called ARGC and ARGV .

The variable argc is an argument counter that counts the number of Argument on the commands line .Whereas argv is an argument vector and represent an array of character pointers that points to the command line argument .The size of this array will be equal to the value of argc .