View Compilation Error

0_0_24989444_23702.cpp: In function 'int main()':
0_0_24989444_23702.cpp:9:23: error: 'memset' was not declared in this scope
   memset(a,0,sizeof(a));
                       ^
0_0_24989444_23702.cpp:32:7: error: 'c' was not declared in this scope
    if(c == n)
       ^