In a simple word, we instruct a compiler to find stdio.h file and read/process it. The #include is called preprocessor directive. We pass some string argument to printf() function and then it return the string to the screen – the standard output. That is why we need to include #include in our program so that compiler know what the printf() is. In the program we define the main() function but what about printf() ? The definition of the printf() is in stdio.h header file. the end of the main()/other function’s body is indicated by }īuild and run your program. no return statement coz main() return nothing (void) the following printf() return the age. the \n is an escape to new line.more on this later. In the following three printf()s, they receive and return output - your terminal/console/screen that defined in stdio.h. printf() is another built-in/standard function for standard every C/C++ statement will be terminated by (semi colon) declare and initialize a variable with integer type. the beginning of the main/other function body is indicated by } – a curly brace the second void means, main() doesn't receive anything
the first void means main() doesn't return anything this ' // ' means line comment.will be ignored by compiler Make sure you set this project to be compiled as C code. You can see then, C/C++ programs just consist of functions with main() as the execution point.Ĭreate a new empty Win32 console application project named mymain and add a C++ source file named mymainsrc as done in previous lab practice.
In your C/C++ program also, there are other functions that you already familiar with such as printf(). A complete story about the main() function is given in Module Y. That means compiler start the program execution at main() function. If you have gone through Module 1 and 2, the main() function is needed for the execution point of C/C++ programs. A complete story of main() is in C and C++ main() story. More printf() and its family examples can be found in C formatted input/output. Tutorial references are: C/C++ intro & brief history, C/C++ data type 1, C/C++ data type 2, C/C++ data type 3 and C/C++ statement, expression & operator 1, C/C++ statement, expression & operator 2 and C/C++ statement, expression & operator 2.main() function – the need of main() as C/C++ execution point.Be familiar with the compiler – more on project options.C LAB WORKSHEET 4 C main() and printf() functions 1
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