Compilare: main.cpp: In function 'int main()': main.cpp:102:18: warning: unused variable 'lin' [-Wunused-variable] 102 | int n, i, j, lin, col; | ^~~ main.cpp:102:23: warning: unused variable 'col' [-Wunused-variable] 102 | int n, i, j, lin, col; | ^~~ main.cpp:103:10: warning: unused variable 'c' [-Wunused-variable] 103 | char c; | ^ main.cpp: In function 'char num(char)': main.cpp:68:1: warning: control reaches end of non-void function [-Wreturn-type] 68 | } | ^