View Compilation Error

0_0_26737322_25595.cpp: In function 'int main()':
0_0_26737322_25595.cpp:72:26: error: 'memset' was not declared in this scope
   memset(you,0,sizeof you);
                          ^
0_0_26737322_25595.cpp:73:15: error: 'strlen' was not declared in this scope
   l1=strlen(s1);
               ^