sant1.cpp: In function 'int main()': sant1.cpp:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result sant1.cpp:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result sant1.cpp: In function 'bool cmp(interval, interval)': sant1.cpp:30: warning: control reaches end of non-void function