divider.cpp: In function 'int main()': divider.cpp:16: warning: operation on 'c' may be undefined divider.cpp:25: warning: operation on 'ca' may be undefined divider.cpp:26: warning: operation on 'cb' may be undefined divider.cpp:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result