// Chapter 4 6805 C programs// Jonathan W. Valvano// This software accompanies the book,// Embedded Microcomputer Systems: Real Time Interfacing// published by Brooks Cole, 1999// Program 4.3. This C function is nonreentrant because of the read-modify-write access to a global. unsigned int Money;  /* bank balance implemented as a global *//* add 100 dollars */void more(void){	Money += 100;}// Program 4.5. This C function is nonreentrant because of the write-read access to a global. int temp;  /* global temporary *//* calculate x+2*d */int mac(int x, int d){	temp = x+2*d;    /* write to a global variable */       return (temp);}  /* read from global */// Program 4.7. This C function is nonreentrant because of the multi-step write access to a global. int info[2];  /* 32-bit global */void set(int x, int y){    info[0]=x;    info[1]=y;}