Compilare: user.cpp: In function ‘int main()’: user.cpp:83:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ user.cpp:86:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^ user.cpp: In function ‘int grad(int)’: user.cpp:24:12: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] return k; ^ user.cpp: In function ‘int gradpar()’: user.cpp:45:19: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(grad(i)%2==1) return 0; ^ user.cpp: In function ‘int main()’: user.cpp:45:19: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:21:9: note: ‘k’ was declared here int k; ^