View Compilation Error

0_0_22580036_11158.cpp: In function 'int main()':
0_0_22580036_11158.cpp:6:16: error: 'gets' was not declared in this scope
  while(gets(str) != NULL){
                ^
0_0_22580036_11158.cpp:13:11: error: 'puts' was not declared in this scope
   puts(str);
           ^