Structure of a C program:
- C application is a collection of header files and C source files
- C source program is a combination of one or more functions.
- Header file is a collection of pre-defined functions and variables.
- Function is nothing but a set of instructions that performs a particular task.
- Every C program at least contains one function called main().
- Execution of a C program starts from main function only.
- C is a case sensitive language, so that all the instructions of a program should be in small case only except some pre defined names (which were defined in upper case).
- Functions is of two types
- Pre-defined functions
- User defined functions
- The most useful functions for any kind of applications were already developed along with the language and placed in some libraries such as printf(), scanf() ……
- As like pre-defined functions programmer can also develop their own functions according to their requirement called as user defined functions.
- Any requirement of pre-defined function in user application just includes that library with the help of pre processer directives to work with that corresponding library function.
source.c:
void main()
{
logic
}
void fun1()
{
logic
}
void fun2()
{
logic
}
....
