View Compilation Error

0_0_13923513_19124.cpp: In function 'int main()':
0_0_13923513_19124.cpp:8:17: error: 'x' was not declared in this scope
     scanf("%d",&x);
                 ^
0_0_13923513_19124.cpp:9:25: error: 'memset' was not declared in this scope
     memset(a,0,sizeof(a));
                         ^
0_0_13923513_19124.cpp:12:5: error: 'q' was not declared in this scope
     q=1;
     ^
0_0_13923513_19124.cpp:18:9: error: 's' was not declared in this scope
         s=10000000;
         ^