Compilare: user.cpp: In function ‘int main()’: user.cpp:10:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%c",&n,&c,&c1); ^ user.cpp:11:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=n;i++) {fscanf(f,"%c",&c1); v[i]=c1-'A'+1;} ^ user.cpp:30:5: warning: ‘d’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i=s;i<=d;i++) fprintf(g,"%c",'A'+v[i]-1); ^ user.cpp:30:5: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized]