View Compilation Error

0_0_33363474_16826.cpp: In function 'int main()':
0_0_33363474_16826.cpp:29:19: error: 'strlen' was not declared in this scope
 int len=strlen(str);
                   ^
0_0_33363474_16826.cpp:35:14: error: expected '}' at end of input
 oz[top++]='(';
              ^
0_0_33363474_16826.cpp:35:14: error: expected '}' at end of input
0_0_33363474_16826.cpp:35:14: error: expected '}' at end of input
0_0_33363474_16826.cpp:35:14: error: expected '}' at end of input