Prata exs 8.7

#include <stdio.h>
#include <ctype.h>
#define BASE1 8.50
#define BASE2 9.50
#define BASE3 10.00
#define BASE4 11.0
#define WEEK  40.0
#define OTIME 1.5

#define TRATE1 0.15
#define TRATE2 0.20
#define TRATE3 0.25
#define TBREAK1 300.0
#define TBREAK2 450.0
float salary_count(int);
float    tax_count(float);
int main(void)
{
    char ch;
    float sal,tax;
    printf("1)%f 2)%f 3)%f 4)%f    Q for exit\n",BASE1,BASE2,BASE3,BASE4);
    while((ch = getchar())!= 'Q')
    {
      sal = 0.0;
       if(ch== '1'|| ch=='2'|| ch=='3' || ch == '4' )
        {
            sal = salary_count(ch);
            printf("salary %f\n",sal);

        }
        else
            printf("your input is wrong, try again\n");

        if(sal)//counting taxes, if sal>0
        {
            tax = tax_count(sal);
        }
        printf("tax is  %f\n",tax);
        printf("1)%f 2)%f 3)%f 4)%f    Q for exit\n",BASE1,BASE2,BASE3,BASE4);

        while(getchar()!='\n')//gets rid of input, including '\n'
            continue;
    }

    return 0;
}
float salary_count(int c)
{
    float hours,hourly_rate,result;
    printf("How many hours have you done this week?\n");
    scanf("%f",&hours);

    switch(c)
    {
    case '1':
        hourly_rate = BASE1;
        break;
    case '2':
        hourly_rate = BASE2;
        break;
    case '3':
        hourly_rate = BASE3;
        break;
    case '4':
        hourly_rate = BASE4;
        break;
    default:
        printf("nedopustimyi vvod\n");

    }//end of switch

    if(hours<=40)
        result = hours*hourly_rate;
    else
        result = (hours-WEEK)*hourly_rate*OTIME +WEEK*hourly_rate;

    return result;

}
float tax_count(float s)
{
    float t;
    if(s<=TBREAK1)
        t = s*TRATE1;
    else if(s<=TBREAK2)
        t = (s-TBREAK1)* TRATE2+ (TBREAK1)*TRATE1;
    else
        t = (s-TBREAK2)*TRATE3 +(TBREAK2-TBREAK1)*TRATE2+ TBREAK1*TRATE1;
    return t;


}