ron.cpp:2:18: conio.h: No such file or directory ron.cpp:13: `main' must return `int' ron.cpp:13: return type for `main' changed to `int' ron.cpp: In function `int main(...)': ron.cpp:14: warning: unused variable `int i1' ron.cpp:14: warning: unused variable `int i2' ron.cpp:14: warning: unused variable `int i3' ron.cpp:14: warning: unused variable `int z'