View Compilation Error

0_0_26628672_21046.cpp: In function 'int main()':
0_0_26628672_21046.cpp:30:33: error: 'memset' was not declared in this scope
         memset(sum,0,sizeof(sum));
                                 ^
0_0_26628672_21046.cpp:35:13: error: 'i' was not declared in this scope
         for(i=1;i<=n;i++) {
             ^