[newbie] error C2065: 'b' : undeclared identifier
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Any idea why this code doesn't compile? <pre> // SieveOfErathostenes.cpp : main project file. #include "stdafx.h" #include <bitset> #include <iostream> #include <ctime> using namespace System; int main(array<System::String ^> ^args) { const int N = 2000000; clock_t cstart = clock(); bitset<N + 1> b; int count = 0; int i; for (i = 2; i <= N; i++) b.set(i); i = 2; while (i * i <= N) { if (b.test(i)) { count++; int k = 2 * i; while (k <= N) { b.reset(k); k += i; } } i++; } while (i <= N) { if (b.test(i)) count++; i++; } clock_t cend = clock(); double millis = 1000.0 * (cend - cstart) / CLOCKS_PER_SEC; cout << count << " primes \n" << millis << " milliseconds\n"; return 0; } </pre> Errors: Error 4 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 19 SieveOfErathostenes Error 5 error C2228: left of '.set' must have class/struct/union c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 19 SieveOfErathostenes Error 6 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 24 SieveOfErathostenes Error 7 error C2228: left of '.test' must have class/struct/union c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 24 SieveOfErathostenes Error 8 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 30 SieveOfErathostenes Error 9 error C2228: left of '.reset' must have class/struct/union c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 30 SieveOfErathostenes Error 10 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfEratho
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Any idea why this code doesn't compile? <pre> // SieveOfErathostenes.cpp : main project file. #include "stdafx.h" #include <bitset> #include <iostream> #include <ctime> using namespace System; int main(array<System::String ^> ^args) { const int N = 2000000; clock_t cstart = clock(); bitset<N + 1> b; int count = 0; int i; for (i = 2; i <= N; i++) b.set(i); i = 2; while (i * i <= N) { if (b.test(i)) { count++; int k = 2 * i; while (k <= N) { b.reset(k); k += i; } } i++; } while (i <= N) { if (b.test(i)) count++; i++; } clock_t cend = clock(); double millis = 1000.0 * (cend - cstart) / CLOCKS_PER_SEC; cout << count << " primes \n" << millis << " milliseconds\n"; return 0; } </pre> Errors: Error 4 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 19 SieveOfErathostenes Error 5 error C2228: left of '.set' must have class/struct/union c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 19 SieveOfErathostenes Error 6 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 24 SieveOfErathostenes Error 7 error C2228: left of '.test' must have class/struct/union c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 24 SieveOfErathostenes Error 8 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 30 SieveOfErathostenes Error 9 error C2228: left of '.reset' must have class/struct/union c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfErathostenes\SieveOfErathostenes.cpp 30 SieveOfErathostenes Error 10 error C2065: 'b' : undeclared identifier c:\Users\Administrator\Documents\Visual Studio 2008\Projects\SieveOfErathostenes\SieveOfEratho