Value not calculated

[RicOz6]

Hi, I'm trying to write a program that works out BMI from inputted height and weight, it all works fine but the calculation for bmi doesn't do anything and I don't understand why.

#include <stdio.h>

int main (void)
{
	float arrayName[5][3];
	int i;


	for (i=1; i<6; i++)
	{
	printf("\nEnter the Weight of person %d in (kg): ", i);
	scanf("%f", &arrayName[i-1][0]);
	printf("\nEnter the Height of person %d in (m): ", i);
	scanf("%f", &arrayName[i-1][1]);

	arrayName[i-1][2]=arrayName[i-1][1]/arrayName[i-1][0]*arrayName[i-1][0];


	}


	printf("\n\n\tPerson #\t:\tWeight (kg)\t:\tHeight (m)\t:\tBMI\t");
	printf("\n\t\t1\t:\t%0.2f\t\t:\t%0.2f\t\t:\t%0.2f\t", arrayName[0][0], arrayName[0][1], arrayName[0][2]);
	printf("\n\t\t2\t:\t%0.2f\t\t:\t%0.2f\t\t:\t%0.2f\t", arrayName[1][0], arrayName[1][1], arrayName[1][2]);
	printf("\n\t\t3\t:\t%0.2f\t\t:\t%0.2f\t\t:\t%0.2f\t", arrayName[2][0], arrayName[2][1], arrayName[2][2]);
	printf("\n\t\t4\t:\t%0.2f\t\t:\t%0.2f\t\t:\t%0.2f\t", arrayName[3][0], arrayName[3][1], arrayName[3][2]);
	printf("\n\t\t5\t:\t%0.2f\t\t:\t%0.2f\t\t:\t%0.2f\t\n", arrayName[4][0], arrayName[4][1], arrayName[4][2]);

	return 0;

}

[anduril462]

Please read the forum guidelines and use code tags next time.

Could it be your BMI formula? Think about order of operations. You basically have: BMI = height / weight * weight.
It divides height by weight, then multiplies that by weight, cancelling out the divide and effectively giving you: BMI = height

What is the formula for BMI? We're programmers, not nutrition and health experts, so help us out a bit.

Also, why aren't you using a loop for printing output?

EDIT: Traditionally, an array processing loop looks like

int i, array[SIZE];
for (i = 0; i < SIZE; i++) {
    // do stuff in here
}

It's easier to avoid going off the end of the array that way, and you can just adjust the index when you print it. It's safer and easier for people to read too.

[RicOz6]

it's height/weight^2 apparently so that's probably the problem and I'll try using a loop for the output, I only started programming yesterday so it's all pretty new at the moment.

[anduril462]

Well, you're off to a good start. A set of ( ) should handle your order of operations problem just fine.

[RicOz6]

sorry, weight/height^2

[Babkockdood]

Put parenthesis in appropriate places. Your compiler divides before it multiplies.