Language: C++

#include<stdio.h>
using namespace std;

int main() {
	for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
		for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
			printf("%dx%d=%d\n", ???????????????, ???????????????, ???????????????*???????????????);
		}
	}
}

Compiler output:
a.cc:7:109: warning: trigraph ??) ignored, use -trigraphs to enable [-Wtrigraphs]
    7 |                         printf("%dx%d=%d\n", ???????????????, ???????????????, ???????????????*???????????????);
a.cc: In function 'int main()':
a.cc:5:18: error: expected unqualified-id before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                  ^
a.cc:5:17: error: expected ';' before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                 ^~
      |                 ;
a.cc:5:18: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                  ^
a.cc:5:19: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                   ^
a.cc:5:20: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                    ^
a.cc:5:21: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                     ^
a.cc:5:22: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                      ^
a.cc:5:23: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                       ^
a.cc:5:24: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                        ^
a.cc:5:25: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                         ^
a.cc:5:26: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                          ^
a.cc:5:27: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                           ^
a.cc:5:28: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                            ^
a.cc:5:29: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                             ^
a.cc:5:30: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                              ^
a.cc:5:31: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                               ^
a.cc:5:32: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                ^
a.cc:5:34: error: expected primary-expression before '=' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                  ^
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:37: error: expected ':' before ';' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                     ^
      |                                     :
a.cc:5:37: error: expected primary-expression before ';' token
a.cc:5:39: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                       ^
a.cc:5:40: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                        ^
a.cc:5:41: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                         ^
a.cc:5:42: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                          ^
a.cc:5:43: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                           ^
a.cc:5:44: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                            ^
a.cc:5:45: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                             ^
a.cc:5:46: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                              ^
a.cc:5:47: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                               ^
a.cc:5:48: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                                ^
a.cc:5:49: error: expected primary-expression before '?' token
    5 |         for (int ??????????????? = 1; ??????????????? <= 9; ???????????????++) {
      |                                                 ^
a.cc:5:50: error: exp