第5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;
}