View Compilation Error

0_0_37428551_11657.cpp: In function 'int main()':
0_0_37428551_11657.cpp:5:18: error: 'scanf' was not declared in this scope
     scanf("%d",&T);
                  ^
0_0_37428551_11657.cpp:12:21: error: 'max' was not declared in this scope
         if(max(ch,cm)-min(ch,cm)<=180){//<=180
                     ^
0_0_37428551_11657.cpp:12:32: error: 'min' was not declared in this scope
         if(max(ch,cm)-min(ch,cm)<=180){//<=180
                                ^
0_0_37428551_11657.cpp:13:53: error: 'printf' was not declared in this scope
             printf("%d\n",int(max(ch,cm)-min(ch,cm)));
                                                     ^
0_0_37428551_11657.cpp:15:61: error: 'printf' was not declared in this scope
             printf("%d\n",int((360.0-max(ch,cm))+min(ch,cm)));
                                                             ^