第五章例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;
}