prog.cpp: In function ‘int main()’:
prog.cpp:11:16: error: invalid types ‘long long unsigned int[int]’ for array subscript
if (n[i] == 4 || n[i] == 7)
^
prog.cpp:11:29: error: invalid types ‘long long unsigned int[int]’ for array subscript
if (n[i] == 4 || n[i] == 7)
^
prog.cpp:16:11: error: ‘i’ was not declared in this scope
if (n[i] == 4 || n[i] == 7)
^