View Compilation Error

0_0_33530934_29486.cpp: In function 'int main()':
0_0_33530934_29486.cpp:38:18: error: 'i' does not name a type
     for(register i = 2; i <= 100000000; ++i)
                  ^
0_0_33530934_29486.cpp:38:25: error: expected ';' before 'i'
     for(register i = 2; i <= 100000000; ++i)
                         ^
0_0_33530934_29486.cpp:38:25: error: 'i' was not declared in this scope