work/source: In function ‘int main()’:
work/source:34: error: ‘stdin’ was not declared in this scope
work/source:34: error: ‘freopen’ was not declared in this scope
work/source:35: error: ‘stdout’ was not declared in this scope
work/source:37: error: ‘scanf’ was not declared in this scope
work/source:57: error: ‘printf’ was not declared in this scope
