5.1.1 A Simple Example( 1/4 Consider the following procedure echo which is global to all applications char chin chou void echo chin getchar shout chin putchar(chou)10 5.1.1 A Simple Example（1/4) • Consider the following procedure echo • which is global to all applications char chin, chout; void echo() { chin = getchar(); chout = chin; putchar(chout); }