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C Program to Display its own Source Code as Output

C Program to Display its own Source Code as Output

To understand this example, you should have knowledge of following C programming topics:
Though this problem seems complex but, the concept behind this program is very simple; display the content from the same file you are writing the source code.
Procedure to display its own source code in C programming
A predefined macro __FILE__ contains the location of a C programming file, it is working on. For example:
#include <stdio.h>
int main(){
The output of this program is the location of this C programming file.

C program to display its own source code using __FILE__

#include <stdio.h>
int main() {
    FILE *fp;
    char c;
    fp = fopen(__FILE__,"r");
    do {
         c = getc(fp);
    while(c != EOF);
    return 0;
This program displays the content of this particular C programming file(source code) because __FILE__ contains the location of this C programming file in a string.


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Note : All the programs are tested under Turbo C/C++ compilers.
It is assumed that,
Programs run under DOS environment, The underlying machine is an x86 system, Program is compiled using Turbo C/C++ compiler.
The program output may depend on the information based on this assumptions (for example sizeof(int) == 2 may be assumed).
Predict the output or error(s) for the following:

void main()
int const * p=5; printf("%d",++(*p));
Compiler error: Cannot modify a constant value.
p is a pointer to a "constant integer". But we tried to change the value of the "constant integer".
char s[ ]="man"; int i;
for(i=0;s[ i ];i++)
printf("\n%c%c%c%c",s[ i ],*(s+i),*(i+s),i[s]);
Answer: mmmm
aaaa nnnn

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