View Compilation Error

0_0_20785490_4774.cpp:1:11: error: #include expects "FILENAME" or <FILENAME>
 #include  
           ^
0_0_20785490_4774.cpp: In function 'int main()':
0_0_20785490_4774.cpp:26:18: error: 'scanf' was not declared in this scope
     scanf("%d",&t);  
                  ^
0_0_20785490_4774.cpp:34:23: error: 'printf' was not declared in this scope
         printf("1 1\n");  
                       ^
0_0_20785490_4774.cpp:38:33: error: 'printf' was not declared in this scope
         printf("%d %d\n",n/k,m/k);  //分子与分母化简  
                                 ^