how can I work with digraphs and trigrpahs in bloodshed/DevC++ compiler

Question

In compiler trigraphs and digraphs are not replacing by the corresponding single characters. Rather it's giving a warning something like this,

12:26 G:\BIN\cLang\macro2.cpp [Warning] trigraph ??= ignored, use -trigraphs to enable

I want to know why this type of warning is giving and how can I solve this to use trigraphs and digraphs. In what purposes they were in the language???

NOTE - I want to see how digraphs & trigraphs work, so dont tell me to not to use them because they are obsolete... Thanks Advance

I don't know which compiler you use, but what happens if you pass "-trigraphs" as an argument as suggested? — Lucas, Jun 28 '12 at 13:48
I am using bloodeshed/DevC++ in windows 7 .. can u please tell me how to pass "-trigraphs" ?? — amin__, Jun 28 '12 at 14:00

score 1 · Answer 1 · answered Jun 28 '12 at 13:49

1

The message tells you what to do, when you invoke the compiler add option -trigraphs

answered Jun 28 '12 at 13:49

SpacedMonkey

2,725
1
16
17

score 0 · Answer 2 · answered Jun 28 '12 at 13:59

Looks similar to the warning I get with gcc.

Compiled without any flags:

$ gcc trigraphs.c 
trigraphs.c:5:10: warning: trigraph ??= ignored, use -trigraphs to enable

So I add the flag suggested by the compiler:

$ gcc -trigraphs trigraphs.c 
$ ./a.out 
a test: #
$

This is my code that I stored in the file trigraphs.c:

#include <stdio.h>

int main(void){
        printf("a test: ??=\n");
        return 0;
}

how can I work with digraphs and trigrpahs in bloodshed/DevC++ compiler

2 Answers2