bemo.cpp: In function 'int main()': bemo.cpp:74: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result bemo.cpp:77: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result bemo.cpp:72: warning: 'first' may be used uninitialized in this function bemo.cpp:72: warning: 'last' may be used uninitialized in this function