Tag: pythagorean theorem

Given two points A(x1, y1) and B(x2, y2), find the distance between them.

Formula To Calculate Distance Between Two Points using Pythagorean theorem

distance = sqrt( (x2 – x1) * (x2 – x1) + (y2 – y1) * (y2 – y1) );

Note: sqrt() is a builtin method present in math.h header file.

Related Read:
Basic Arithmetic Operations In C

Expected Output for the Input

User Input:
Enter point 1 (x1, y1)
1
1
Enter point 2 (x2, y2)
9
9

Output:
Distance between (1.00, 1.00) and (9.00, 9.00) is 11.31

Video Tutorial: C Program To Calculate Distance Between Two Points

Source Code: C Program To Calculate Distance Between Two Points

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

int main()
{
    float x1, y1, x2, y2, distance;

    printf("Enter point 1 (x1, y1)\n");
    scanf("%f%f", &x1, &y1);

    printf("Enter point 2 (x2, y2)\n");
    scanf("%f%f", &x2, &y2);

    distance = sqrt( (x2 - x1)*(x2 - x1) + (y2 - y1)*(y2 - y1) );

    printf("Distance between (%0.2f, %0.2f) and (%0.2f, %0.2f) is %0.2f\n", x1, y1, x2, y2, distance);

    return 0;
}

Output 1:
Enter point 1 (x1, y1)
0
0
Enter point 2 (x2, y2)
5
0
Distance between (0.00, 0.00) and (5.00, 0.00) is 5.00

Output 2:
Enter point 1 (x1, y1)
2
3
Enter point 2 (x2, y2)
10
8
Distance between (2.00, 3.00) and (10.00, 8.00) is 9.43

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