Short Artish with function

#include <stdio.h>
//short artishok with functions, some questions
//1. why Pay attention prints, even when first in input is alpha? check in main()
//2. how make while ... a, b, c, q  more compact?
//


char get_char(void);
float  get_float (void);

int main()
{
    char ch;
    float  fl;

    while((ch =get_char())!='q')
    {
        printf("%c\n",ch);//print proper input,rid of user mistakes
        fl= get_float();
        printf("%f\n",fl);

    }


    return 0;
}
char get_char(void)
{//input:38kn... - get rid of everything
 //      kn... takes k, get rid of everything else
 //      k     takes k
    char c;
    printf("Chose a,b,c or q?\n");
    while((c=getchar())!= 'a' && c!='b' && c!='c' &&c!='q')
//  while(!isalpha(c=getchar()))  //while first symbol in input is not alpha
    {
        //printf("Pay attention, you suppose to input a,b,c or q\n");

    }
    while(getchar()!='\n')  //rid of rest of input, including '\n'
        continue;
        return c;
}//end of get_char

float get_float(void)//this one is ok
{
    float amount;
    int sc_res =0;
    do
    {
        printf("how much of it do you want?\n");
        sc_res = scanf("%f",&amount);
        if(!sc_res)
            scanf("%*s");
    }while(!sc_res);
    return amount;
}