View Compilation Error

0_0_17906414_7957.cpp: In function 'int main()':
0_0_17906414_7957.cpp:7:26: error: 'memset' was not declared in this scope
   memset(sum,0,sizeof sum);
                          ^
0_0_17906414_7957.cpp:20:3: error: expected ';' before '}' token
   } 
   ^