View Compilation Error

0_0_35977758_18170.cpp: In function 'bool input()':
0_0_35977758_18170.cpp:12:8: error: 'cin' was not declared in this scope
  while(cin>>r>>c) {
        ^
0_0_35977758_18170.cpp: In function 'void cal()':
0_0_35977758_18170.cpp:37:27: error: 'printf' was not declared in this scope
  printf("%.3lf\n",dp[0][0]);
                           ^