C - โปรแกรมคิดค่าน้ำ โดยอัตราค่าน้ำจะคิดตามประเภทผู้ใช้ซึ่งมี 3 กลุ่ม

#include <stdio.h>
#include <conio.h>
int main()
{
    int i;
    float e,f,g,n,x,z,t;
    char User[3] = {'H','C','I'};
    float a = 45;
    float b = 25000;
    float c = 50000;
    float d = 75000;
    
    for(i=0;i<=3;i++){
    printf("\nInput select the User groups common household \n1. H\n2. C\n3. I\n: ");
    scanf("%s",&User[i]);
    printf("\nInput the amount of water used: ");
    scanf("%f",&n);

    x = n*0.5;
    z = x + a;
    
    e = n - 4000000;
    t = (e*0.25) + b;

    f = c + b;
    g = d + b;
    
    if(User[i] == 'H'){
    printf("Your fee = %f\n",a);
    printf("Your water bill = %f\n",z);
}
    if(User[i] == 'C' && n <= 4000000){
    printf("Your water bill = %f\n",b);
}
    if(User[i] == 'C' && n > 4000000){
    printf("Your water bill = %f\n",t);
}
    if(User[i] == 'I' && n <= 4000000){
    printf("Your water bill = %f\n",b);
}
    if(User[i] == 'I' && n > 4000000 && n <= 10000000){
    printf("Your water bill = %f\n",f);
}
    if(User[i] == 'I' && n > 10000000){
    printf("Your water bill = %f\n",g);
}
}
getch();
}