View Compilation Error

0_0_34133736_22717.cpp: In function 'int main()':
0_0_34133736_22717.cpp:7:9: error: 'gets' was not declared in this scope
   gets(a);
         ^
0_0_34133736_22717.cpp:18:20: error: 'printf' was not declared in this scope
    printf("%c",a[i]);
                    ^
0_0_34133736_22717.cpp:22:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^