Compilare: user.cpp: In function ‘int main()’: user.cpp:17:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i %i%*c",&n,&x); ^ user.cpp:22:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%c",&a); ^ user.cpp:37:18: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=p-1;i>=st;--i) ^