View Compilation Error

0_0_26086865_16396.cpp: In function 'int main()':
0_0_26086865_16396.cpp:4:20: error: 'scanf' was not declared in this scope
     scanf("%d\n",&T);
                    ^
0_0_26086865_16396.cpp:14:38: error: 'printf' was not declared in this scope
                     printf("%d\n",i*j);
                                      ^
0_0_26086865_16396.cpp:16:41: error: 'printf' was not declared in this scope
                     printf("%d ",(i+j)%n);
                                         ^
0_0_26086865_16396.cpp:24:38: error: 'printf' was not declared in this scope
                     printf("%d\n",i*j);
                                      ^
0_0_26086865_16396.cpp:26:39: error: 'printf' was not declared in this scope
                     printf("%d ",i*j%n);
                                       ^