sort2dist.cpp: In function 'void swap(int*, int, int*, int)': sort2dist.cpp:23: warning: unused variable 'c' sort2dist.cpp: In function 'int main()': sort2dist.cpp:36: warning: unused variable 'b' sort2dist.cpp:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result sort2dist.cpp: In function 'int comp(int*, int, int*, int)': sort2dist.cpp:21: warning: control reaches end of non-void function