ro.cpp: In function 'int main()': ro.cpp:37: warning: unused variable 'v' ro.cpp:37: warning: unused variable 'nr' ro.cpp:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result ro.cpp:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result ro.cpp:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result