View Compilation Error

0_0_15927144_30793.cpp:81:15: error: empty character constant
   memset(str1,'',sizeof(str1));
               ^
0_0_15927144_30793.cpp:82:15: error: empty character constant
   memset(str2,'',sizeof(str2));
               ^
0_0_15927144_30793.cpp:83:15: error: empty character constant
   memset(str3,'',sizeof(str3));
               ^