View Compilation Error

0_0_34134073_29370.cpp:3:7: error: expected nested-name-specifier before 'name'
 using name space std;
       ^
0_0_34134073_29370.cpp: In function 'void findf()':
0_0_34134073_29370.cpp:7:19: error: 'strlen' was not declared in this scope
     int n=strlen(s);
                   ^