Question

I want the function getCategory() to return “invalid” , instead of printing the word “invalid” (i.e instead of using printf ) when input to the function is invalid (i.e.when either height or weight are lower then zero).
please help:

#include<stdio.h>
#include<conio.h>
char getCategory(float height,float weight)
{
char invalid = '\0'; 
float bmirange;
if(height<=0 || weight<=0)
return invalid;
else
 {
height=height*0.01;       
bmirange=[weight/(height*height)];
if(bmirange< 15 )
   return starvation;
 }  
}

/* return the following to category
If bmi range < 15 then category is "starvation"
    If bmi range >=15 && bmi range < 18.5 then category is "underweight"
    If bmi range >=18.5 && bmi range < 25 then category is "normal"
    If bmi range >= 25 && bmi range < 30 then category is "overweight"
    If bmi range >=30 && bmi range < 40 then category is "obese"
    If bmi range >=40 then category is "morbidly obese
*/


int main()
 {
 char Category;
 float height,weight;
 printf("enter height");
 scanf("%f",&height);
 printf("enter weight");
 scanf("%f",&weight);
 Category=getCategory(height,weight);
 if(Category == 0)
 printf("invalid");
 else
 printf("%c", Category);
 }

Answer 1

Change the return type to a char *, then return a pointer to your various category strings.
You also need to fill in the checks for the various bmi levels.

Looks a lot like homework; please mark it as such if so.

Here’s my solution… but I’ve randomized the order of the lines since you do need to do your own homework. There should be a few hints in this though, such as struct and the return lines.

    scanf("%f",&height);
struct bmicategory {
}
        {18.5, "normal"},
    return categories[i-1].name;
    float bmi = weight / (height * height);
    struct bmicategory categories[] = {
    printf("enter weight (in kg): ");

    };
    char *name;

    return 0;

        {40, "morbidly obese"},
        {15, "underweight"},
        }
    scanf("%f",&weight);
    for(i=1; i<sizeof(categories)/sizeof(struct bmicategory); i++) {
#include<stdio.h>
        if(bmi < categories[i].value) {
            break;
    printf("%s\n", category);
    height = height * 0.01;
    printf("enter height (in cm): ");
        {25, "overweight"},

    category=getBmiCategory(height,weight);

int main() {
    float value;
    int i;
    /* printf("BMI = %f\n", bmi); */
}
};
    float height;
        {30, "obese"},
    }
    char *category;

    char *name = NULL;
        {0, "starvation"},
char *getBmiCategory(float height, float weight) {
    float weight;