pluton.cpp: In function 'int main()': pluton.cpp:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result pluton.cpp:18: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result pluton.cpp:9: warning: 'c' may be used uninitialized in this function