fillmat.cpp: In function 'int main()': fillmat.cpp:49: warning: unused variable 'x' fillmat.cpp:50: warning: unused variable 'd' fillmat.cpp:50: warning: unused variable 'd2' fillmat.cpp:50: warning: unused variable 's' fillmat.cpp:47: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result fillmat.cpp:60: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result