Compilare: user.cpp: In function ‘int main()’: user.cpp:34:21: warning: left operand of comma operator has no effect [-Wunused-value] for (;j1<h,i1<w;c1+=c,j1+=j,i1+=i) ^ user.cpp:27:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&w,&h,&n); ^ user.cpp:42:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^