Compilare: main.cpp: In function 'void back(int, int, int)': main.cpp:35:9: warning: unused variable 'iv' [-Wunused-variable] int iv,jv,d; ^~ main.cpp:35:12: warning: unused variable 'jv' [-Wunused-variable] int iv,jv,d; ^~ main.cpp:35:15: warning: unused variable 'd' [-Wunused-variable] int iv,jv,d; ^ main.cpp: In function 'int main()': main.cpp:64:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&t); ^ main.cpp:66:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&n); ^