Print Source Code of C program

January 31, 2023

C program to print source code

In this section, we will learn how to write a C program to print source code of the same program in simple steps. We will perform the task with the help of predefined _FILE_ macro and also study about it in detail. This macro will help to extract the location of the C file.

Print Source Code as Output

To display the source code of a C program as the output itself, we can make use of the _FILE_ macro which will help in locating the C file in the memory.

_FILE_ macro will store the location of the C program file:

#include<stdio.h>
int main()
{
    printf("%s",__FILE__);
}

The above mentioned code will give the location of this C program file. Similarly, we can write the code for displaying source code output using this predefined _FILE_ macro.

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Example to display source code as output:

Run

#include<stdio.h> 
int main(void)
{
	char c;
	FILE *fp = fopen(__FILE__, "r");
	do
	{
		c = fgetc(fp);
		putchar(c);
	}
	while (c != EOF);
	fclose(fp);
	return 0;
}

Output:

#include<stdio.h> 
int main(void)
{
	char c;
	FILE *fp = fopen(__FILE__, "r");
	do
	{
		c = fgetc(fp);
		putchar(c);
	}
	while (c != EOF);
	fclose(fp);
	return 0;
}

Alert: The above mentioned codes will not run on online compilers as the file handling commands are associated with the system's memory and are blocked on online compilers.

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