work/source: In function ‘int main(int, char**)’:
work/source:9: error: ‘fopen’ was not declared in this scope
work/source:12: error: ‘fscanf’ was not declared in this scope
work/source:19: error: ‘fprintf’ was not declared in this scope
work/source:20: error: ‘fprintf’ was not declared in this scope
work/source:21: error: ‘fprintf’ was not declared in this scope
work/source:22: error: ‘fclose’ was not declared in this scope
