Compilare: user.cpp: In function ‘int main()’: user.cpp:7:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:9:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a); ^ user.cpp:23:39: warning: ‘i2’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out,"%d %d %d",m,i1+1,i2+1); ^ user.cpp:23:39: warning: ‘i1’ may be used uninitialized in this function [-Wmaybe-uninitialized]