Thread: while loops with arrays

Code:

#include <stdio.h>
#include <math.h>

float average(int sum, int array_size);

float std(int sum, int array_size);

	
	

int main(void)

{
	
	int a[3] = {0};
	int b[3] = {0};
	
	int sum = 0;
	int i = 0;

	float av;
	float st;
	float av2;
	float st2;
	
	printf("Enter three numbers\n");
	
	while (scanf("%d", &a[i]) !=EOF)
	{
		sum += a[i++];

		if (i == 3)
			break;
	}

	av = average(sum, i);
	st = std(sum, i);

	printf("\nThe average of the numbers you entered is %.2f\n",av);
	printf("\nThe standard deviation is %.2f\n",st);

	printf("\nEnter three more numbers\n");

	while (scanf("%d", &b[i]) !=EOF)
	{
		sum += b[i++];

		if (i == 3)
			break;
	}

	av2 = average(sum, i);
	st2 = std(sum, i);

	printf("\nThe average of the numbers you entered is %.2f\n",av2);
	printf("\nThe standard deviation is %.2f\n",st2);

	return 0;
}
float average(int sum, int array_size)
{
	return (float) sum/array_size;
}
float std(int sum, int array_size)
{
	return (float) sqrt((pow(sum,2) + pow(sum/3,2))/array_size - 1);
}

Why isn't the second while loop working properly?

Hello, volk

Before the line:

printf("\nEnter three more numbers\n");

you have omitted to re-initialise variables i and sum to zero...

Cheers from MrB

Thank you very much.