Compilare: user.cpp: In function ‘int main()’: user.cpp:21:17: warning: format ‘%c’ expects argument of type ‘char*’, but argument 3 has type ‘int’ [-Wformat=] fscanf(a,"%c",*v); ^ user.cpp:15:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(a,"%d %d",&n,&m); ^ user.cpp:21:18: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(a,"%c",*v); ^ user.cpp:24:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(a,"%c",&x); ^