Doesn't show a float that has a formula when I execute-CodePudding

I have a formula for the imc float but when I execute, it show 0.0 (in bold in the execution at the end) I can't find my error. pls help!

#include <stdio.h>

int main(){

  float poids, taille, imc; // translate as weight, height, imc
  char reponse; // translate as response

do
{
  printf("\nTapez le poids en kg et la taille en metre "); // translate as Enter the weight in kg and the height in meter
  scanf("%f%f", &poids, &taille); 
  
  imc = poids / (taille * taille); // translate as imc = weight / (height * height)

  printf("L'usager pese %.1f kg, mesure %.2f metre et son imc est de %.1f\n ", poids, taille, imc); // translate as User weighs %.1f kg, measures %.2f meter and his BMI is %.1f

  if(imc < 18.5)

    printf("MAIGREUR, RISQUE ELEVE A ACCRU\n");

  else
    if(imc < 25)

      printf("POIDS NORMAL, RISQUE FAIBLE\n");

    else
      if(imc < 30)

        printf("EMBONPOINT, RISQUE ELEVE\n");

      else
        printf("OBESITE, RISQUE TRES ELEVE\n");

   printf("\nVoulez-vous continuer (o/n) ");
      scanf(" %c", &reponse);
    }while(reponse == 'o' || reponse == 'O');

    
  return 0;
}

Execution:

make -s  ./main

Tapez le poids en kg et la taille en metre 75 130 L'usager pese 75.0 kg, mesure 130.00 metre et son imc est de 0.0

MAIGREUR, RISQUE ELEVE A ACCRU

Voulez-vous continuer (o/n)

CodePudding user response：

Your code is behaving correctly and the formula is correct as well as far as I can tell.

It just so happens that people having a height of 130 meters and a weight of 75 kg can indeed be considered to be very skinny, thus having a very low BMI.

The result turns out to be something around 0.004, which you format as 0.0.

I guess you wanted to enter the height in centimeters, which would require an extra step to divide the height by 100. This leads to a result of roughly 44. Still not a very healthy, but it does qualify as an actual human being ;)

CodePudding user response：

Show your answer with more decimal places.

When your input is 75 180, the answer is 0.002315. Then when you write .1f it shows 0.0

Thus you can write:

printf("L'usager pese %.1f kg, mesure %.2f metre et son imc est de %f\n ", poids, taille, imc);

Or for example:

printf("L'usager pese %.1f kg, mesure %.2f metre et son imc est de %.4f\n ", poids, taille, imc);