请问要输入四次这个怎么办啊？

Question

#include<stdio.h>
#define single_dog 17850
#define the_owner 23900
#define married 29750
#define divorce 14875
int main(void)
{
float tax,s;
char classes;
printf("A:single dog;\tB:head of a household;\nC:married a total of;\tD:break a marriage;\n");
printf("Please chose your classes and enter A--B:");
classes = getchar();
if (classes == 'A')
goto single;
else if (classes == 'B')
goto household;
else if (classes == 'C')
goto have_married;
else if (classes == 'D')
goto break_married;
else
printf("input error!");
single:
{
printf("Please enter your salary now:");
scanf_s("%f", &s);
if (s <= single_dog)
tax = s * 0.15;
else tax = single_dog + (s - single_dog) * 0.28;
}
household:
{
printf("Please enter your salary now:");
scanf_s("%f", &s);
if (s <= the_owner)
tax = s * 0.15;
else tax = the_owner + (s - the_owner) * 0.28;
}
have_married:
{
printf("Please enter your salary now:");
scanf_s("%f", &s);
if (s <= married)
tax = s * 0.15;
else tax = married + (s - married) * 0.28;
}
break_married:
{
printf("Please enter your salary now:");
scanf_s("%f", &s);
if (s <= divorce)
tax = s * 0.15;
else tax = divorce + (s - divorce) * 0.28;
}
printf("So we can konow your tax is %f", tax);
return 0;
}

Answer 1

在每个标签里面，计算完税收之后，用一个goto跳转到最后打印税收那里即可，修改如下：

#include<stdio.h>
#define single_dog 17850
#define the_owner 23900
#define married 29750
#define divorce 14875
int main(void)
{
    float tax,s;
    char classes;
    printf("A:single dog;\tB:head of a household;\nC:married a total of;\tD:break a marriage;\n");
    printf("Please chose your classes and enter A--B:");
    classes = getchar();
    if (classes == 'A')
        goto single;
    else if (classes == 'B')
        goto household;
    else if (classes == 'C')
        goto have_married;
    else if (classes == 'D')
        goto break_married;
    else
        printf("input error!");
    single:
    {
        printf("Please enter your salary now:");
        scanf("%f", &s);
        if (s <= single_dog)
            tax = s * 0.15;
        else tax = single_dog + (s - single_dog) * 0.28;
        goto printTax; 
    }
    household:
    {
        printf("Please enter your salary now:");
        scanf("%f", &s);
        if (s <= the_owner)
            tax = s * 0.15;
        else tax = the_owner + (s - the_owner) * 0.28;
        goto printTax;
    }
    have_married:
    {
        printf("Please enter your salary now:");
        scanf("%f", &s);
        if (s <= married)
            tax = s * 0.15;
        else tax = married + (s - married) * 0.28;
        goto printTax;
    }
    break_married:
    {
        printf("Please enter your salary now:");
        scanf("%f", &s);
        if (s <= divorce)
            tax = s * 0.15;
        else tax = divorce + (s - divorce) * 0.28;
        goto printTax; 
    }
    
    printTax:
    printf("So we can konow your tax is %f", tax);
    return 0;
}