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In this example, you’ll learn to display source of the program using __FILE__ macro.

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To understand this example, you should have the knowledge of the following C programming topics:

• C Preprocessor and Macros
• C File Handling

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Though this problem seems complex, the concept behind this program is straightforward; display the content from the same file you are writing the source code.

In C programming, there is a predefined macro named __FILE__ that gives the name of the current input file.

#include 
int main() {

   // location the current input file.
   printf("%s",__FILE__);
}

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C program to display its own source code

#include 
int main() {
    FILE *fp;
    int c;
   
    // open the current input file
    fp = fopen(__FILE__,"r");

    do {
         c = getc(fp);   // read character 
         putchar(c);     // display character
    }
    while(c != EOF);  // loop until the end of file is reached
    
    fclose(fp);
    return 0;
}