auto.cpp: In function 'int main()': auto.cpp:16: warning: statement has no effect auto.cpp:46: warning: statement has no effect auto.cpp:15: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result auto.cpp:17: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result auto.cpp:20: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result