numar1.cpp: In function 'int main()': numar1.cpp:8: error: 'ifstream' was not declared in this scope numar1.cpp:8: error: expected ';' before 'cin' numar1.cpp:9: error: 'ofstream' was not declared in this scope numar1.cpp:9: error: expected ';' before 'cout' numar1.cpp:14: error: 'cin' was not declared in this scope numar1.cpp:24: error: lvalue required as left operand of assignment numar1.cpp:34: error: lvalue required as left operand of assignment numar1.cpp:42: error: 'cout' was not declared in this scope