Yes, you should be able to write nearly any program and use nearly all APIs without actually including a header, but you will have to tediously cross-check all of your declarations to make sure that they are correct. You will also lose out on any inline definitions provided by headers for optimization.
Using the advantage of C preprocessor we can extract the declaration of printf function from the header file and use it directly in our program. We can write any program without using the header file, but we have to manually put the stuff in our source files. Hello world program in C without using the header file.
When we write any program in C without using header files and compile the program. It (before save the program) will show many error but when we save this program with.C extension. By default compiler include all necessary header file and program will successfully run. But sometimes it may show error for some header files like math.h.In this program, we will create our own source (.c) and header file (.h) files and access their function. We will declare associate functions in header file and write code (definition) in source files. Create your own Header and Source File Example in C. There will be three files. myfun.c - Source file that will contain function definitions.Every C programmer knows about the math.h header file of the C programming language. This header defines various mathematical functions and one macro. All the functions available in this library take double as an argument and return a double as result.
Write a program in C to draw a circle on screen using graphics.h header file In this program, we will draw a circle on screen having centre at mid of the screen and radius of 80 pixels. We will use outtextxy and circle functions of graphics.h header file.Read More
Well you don’t need to create one as this is done by the compiler itself. A compiler compiles your C program into a executable file which is machine formatted and then when you run the program through your IDE, you are actually running the executa.Read More
Other inbuilt arithmetic functions in C: “math.h” and “stdlib.h” header files support all the arithmetic functions in C language. All the arithmetic functions used in C language are given below. Click on each function name below for detail description and example programs.Read More
So, in short, the answer is yes. We can compile C program without header file. But how? Firstly all the function that we generally use like printf, scanf, etc are declared and defined in the header file. So, in a C program header file is used to import some predefined functions. So, in case you don’t want to use a header file?Read More
Write a c program for concatenation two strings without using string.h header file. 7. Write a c program to find the length of a string using pointer. 8. Write a c program which prints initial of any name. 9. Write a c program to print the string from given character. 10. Write a c program to reverse a string 11. Reverse a string using recursion in c 12. String concatenation in c without using.Read More
The difference between the library and user-defined functions is that we do not need to write a code for a library function. It is already present inside the header file which we always include at the beginning of a program. You just have to type the name of a function and use it along with the proper syntax.Read More
Example program: Here, we will use a program that deals with some geometric shapes to illustrate writing a make file to compile a program. The program is made up of 5 source files: main.cpp, a main program. Point.h, header file for the Point class. Point.cpp, implementation file for the Point class. Rectangle.h, header file for the Rectangle class.Read More
In this series my goal is to go trough basics of Linux system programming from the easiest topics like open file, read file and file write to a bit more complicated things like Berkeley sockets network programming. So lets get started with environment setup and an example of program that copies source file into destination file using POSIX API system calls to demonstrate open(), read() and.Read More
How to write a C program to Concatenate Two Strings without using strcat function?. In C Programming, We can concatenate two string in multiple ways. But we will discuss four different approaches for string concatenation in c using For Loop, While Loop, Functions, and Pointers. C program to Concatenate Two Strings without using strlcat() This string concatenation program allows the user to.Read More
Create an XML request in C without using the library. HTTP use to exchange data over the reliable connection like TCP. In HTTP a client (program) try to establish a connection with other programs (Server) to send an HTTP request. If the connection is established between the server and client then the server sends an Http response in order to the Http request. In HTTP mainly GET and POST method.Read More