C Program to display its own source code as output

•  Program:

#include <stdio.h>
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;
}

•  Output:

#include <stdio.h>
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;
}

•  Explain:

#include <stdio.h>
int main() {

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

•  Steps:

1. Open the file you are currently writing using statement fopen(__FILE__,"r") and assign it to the pointer fp.
2. Scan the every character of the file and store it in the variable ch. Print it using statement putchar(ch).
3. Do step 2 until EOF(end of file).
4. Then close the file and exit.