โค๊ดนี้มันเป็น พวกคำนวณค่าBMI(ดัชนีมวลกาย)ตามที่เราป้อนข้อมูลลงไปอ่ะครับ คืออยากจะทราบหลักการทำงานของแต่ละคำสั่ง ช่วยหน่อยนะครับ ขอบคุณล่วงหน้าครับ

#include<stdio.h>
#include<conio.h>
#include<string.h>

int main()
{
     char password[10],user[10],ch;
     int i=0 ;

         printf("\n Enter your User Name : ");
         scanf("%s",user);
         printf("\n Enter your Password : ");

         do{
              ch=getch();
              password[i++]=ch;
              putchar('*');
           }while(ch!=13);
         password[--i]='\0';

         if(strcmp(password,"000000")==0 && strcmp(user,"CC")==0)
          {

          printf("\n Welcome to system\n");
          float findBMI(float height,float weight)
{
    height/=100;
    return weight/(height*height);
}
float findNormalWeight(float height)
{
    height/=100;
    float normalBMI=21;
    return normalBMI*height*height;
}

{
    float h,w,bmi;
    printf("\n\n\nFind BMI.\n");
    printf(" Please enter Height(cm) : ");
    scanf("%f",&h);
    printf(" Plesae enter Weight(kg) : ");
    scanf("%f",&w);
    bmi=findBMI(h,w);

    printf("BMI score is : %.2f\n\n",bmi);
    if(bmi>=40)
      printf(" You are very Fat\nYou should lose your weight about %.0f KG",w-findNormalWeight(h));
    else if(bmi>=35)
      printf(" You are Fat lv2\nYou should lose your weight about %.0f KG",w-findNormalWeight(h));
    else if(bmi>=28.5)
      printf(" You are Fat lv1\nYou should lose your weight about %.0f KG",w-findNormalWeight(h));
    else if(bmi>=23.5)
      printf(" You are tiny fat\nYou should lose your weight about %.0f KG",w-findNormalWeight(h));
    else if(bmi>=18.5)
      printf(" You are normal");
    else if(bmi>=0)
      printf(" You are thin");
    else
      printf("Error Please any key to exit program...");
     

          }

          getch();
}
}