Thread: Simple programming help

Why are the last two equations printing the wrong numbers? Thanks in advance.

Code:

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

int main() {

	int x1,x2,x3,y1,y2,y3;
	float c12,c13,c14;

	printf("What are the first x and y coordinates?\n");
	scanf("%d %d", &x1, &y1);
	printf("What are the second x and y coordinates?\n");
	scanf("%d %d", &x2, &y2);
	printf("What are the third x and y coordinates?\n");
	scanf("%d %d", &x3, y3);
	
	c12 = (pow(x2 - x1,2) + pow(y2 - y1,2));
	c12 = sqrt(c12);
	printf("%.2f\n", c12);
	c12 = (pow(x3 - x1,2) + pow(y3 - y1,2));
	c12 = sqrt(c13);
	printf("%.2f\n", c13);
	c12 = (pow(x3 - x2,2) + pow(y3 - y2,2));
	c12 = sqrt(c14);
	printf("%.2f\n", c14);


	
	return 0;

}

I fixed that problem and the output is still incorrect. For c12 I get the correct answer but for c13 and c14 I am getting 1627902208.00.

Code:

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

int main() {

	int x1,x2,x3,y1,y2,y3;
	float c12,c13,c14;

	printf("What are the first x and y coordinates?\n");
	scanf("%d %d", &x1, &y1);
	printf("What are the second x and y coordinates?\n");
	scanf("%d %d", &x2, &y2);
	printf("What are the third x and y coordinates?\n");
	scanf("%d %d", &x3, y3);
	
	c12 = (pow(x2 - x1,2) + pow(y2 - y1,2));
	c12 = sqrt(c12);
	printf("%.2f\n", c12);
	c13 = (pow(x3 - x1,2) + pow(y3 - y1,2));
	c13 = sqrt(c13);
	printf("%.2f\n", c13);
	c14 = (pow(x3 - x2,2) + pow(y3 - y2,2));
	c14 = sqrt(c14);
	printf("%.2f\n", c14);


	
	return 0;

}

> scanf("%d %d", &x3, y3);
You forgot the & for y3
Which compiler are you using?

Thanks for catching that. I am using Jgrasp with GCC.

Then set it up to compile with
gcc -W -Wall -ansi -pedantic -O2 prog.c

That will catch (along with lots of other stuff) the problem of getting the parameters to printf and scanf mixed up.