View Compilation Error

0_0_27376902_12491.cpp: In function 'int main()':
0_0_27376902_12491.cpp:15:15: error: cannot convert 'int*' to 'char*' for argument '1' to 'char* gets(char*)'
         gets(a);
               ^
0_0_27376902_12491.cpp:16:21: error: cannot convert 'int*' to 'const char*' for argument '1' to 'size_t strlen(const char*)'
         len=strlen(a);
                     ^