View Compilation Error

0_0_18458534_24943.cpp: In function 'int main()':
0_0_18458534_24943.cpp:37:26: error: expected ';' before ')' token
     for(int i=0;i<(1<<20));i++)
                          ^
0_0_18458534_24943.cpp:37:28: error: 'i' was not declared in this scope
     for(int i=0;i<(1<<20));i++)
                            ^