例5-8

#include<stdio.h> float cash; int main(void) {  int choice;  float value;  void income(float number),expend(float number);

 cash=0;  printf("Enter operate choice(0--end,1--income,2--expend):");  scanf("%d",&choice);  while(choice!=0){   if(choice==1||choice==2){          printf("Enter cash value:");    scanf("%f",&value);    if(choice==1)     income(value);    else        expend(value);    printf("current cash:%.2f ",cash); } printf("Enter operate choice(0--end,1--income,2--expend):"); scanf("%d",&choice);

} return 0; } void income(float number) {  cash=cash+number; } void expend(float number) {  cash=cash-number; }