Compilare: user.cpp: In function ‘int main()’: user.cpp:40:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<=n;i++) fscanf(f,"%d",&a[i]); ^ user.cpp:40:43: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long unsigned int*’ [-Wformat=] for (i=1;i<=n;i++) fscanf(f,"%d",&a[i]); ^ user.cpp:51:23: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=] fprintf(g,"%d",a[k]); ^ user.cpp:39:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&k); ^ user.cpp:40:44: 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,"%d",&a[i]); ^