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\n",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;
}