What data source could I use for my stock market program? [closed]

Answer 1

As of Nov 2014, these links are dead.

• Google Finance API: http://code.google.com/apis/finance/
• Yahoo! Finance API: http://developer.yahoo.com/finance/
• Cross-platform C++ charts w/ Qt: http://www.int.com/products/2d/carnac/chart_component.htm