View Compilation Error

0_0_32959210_4453.cpp: In function 'int main()':
0_0_32959210_4453.cpp:11:21: error: 'strlen' was not declared in this scope
   int len = strlen(a);
                     ^
0_0_32959210_4453.cpp:112:4: error: 'cas' was not declared in this scope
    cas
    ^
0_0_32959210_4453.cpp:112:4: error: expected '}' at end of input
0_0_32959210_4453.cpp:112:4: error: expected '}' at end of input
0_0_32959210_4453.cpp:112:4: error: expected '}' at end of input
0_0_32959210_4453.cpp:112:4: error: expected '}' at end of input