**C TUTORIAL**

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**C PROGRAMS**

C Basics

➤ Introduction to C

➤ Compile and Execute

➤ Hello, World! in C

➤ Identifiers & Keywords

➤ Data types in C

➤ Variables in C

➤ Comments in C

➤ Operators in C

➤ Bitwise Operators

➤ Printf() in C

➤ Input using scanf()

C Basic Programs

➤ Size & Range of Data Types

➤ C Programs for Beginners

➤ Add Subtract Multiply & divide

➤ Sum & Average of 3 Numbers

➤ Simple and Compound Interest

➤ Distance between two Points

➤ Find Circle Triangle Area

➤ ASCII Value of Character

➤ Find Square root of Number

➤ Different Swapping Programs

Program description:- **Write a C program to find the distance between two given points.**

The distance formula is derived from the Pythagorean theorem. To find the distance between two points (x_{1}, y_{1}) and (x_{2}, y_{2}), all that you need to do is use the coordinates of these ordered pairs and apply the formula.

**Distance Formula**

Assume we have two points M and N, with coordinates (x_{1}, y_{1}) and (x_{2}, y_{2}) respectively. Their distance can be represented as MN and it can be calculated as given below formula,

The first point (M):- (x_{1}, y_{1})

Second point (N):- (x_{2}, y_{2})

Distance (MN):- √((x_{2}-x_{1})^{2} + (y_{2}-y_{1})^{2})

Example:-

M = (4, 8)

N = (12, 14)

Then distance between M and N is, MN = √((12-4)^{2} + (14-8)^{2}) = √(64 + 36) = √(100) = 10

```
#include<stdio.h>
#include<math.h>
int main()
{
int x1, y1, x2, y2, x, y, distance;
// take first point's coordinates
printf("Enter coordinates of first point: ");
scanf("%d %d",&x1, &y1);
// take second point's coordinates
printf("Enter coordinates of second point: ");
scanf("%d %d",&x2, &y2);
x = (x2-x1);
y = (y2-y1);
distance = sqrt(x*x + y*y);
// display result
printf("Distance = %d", distance);
return 0;
}
```

The Output for different test cases are:-

Enter coordinates of first point: `0 0`

Enter coordinates of second point: 6 8

Distance = 10

Enter coordinates of first point: `4 6`

Enter coordinates of second point:` 28 13`

Distance = 25

Enter coordinates of first point: `4 8`

Enter coordinates of second point: `12 14`

Distance = 10

In this C program to find the distance between two points, to find the square root of a number we use a predefined function

which is defined in **sqrt()**

library header file.**math.h**

In this program, the x1 and x2 variables store the value of the x-axis of both points. Similarly, the y1 and y2 variables store the value of the y-axis of both points.

The difference of x-axis of both points is stored in the variable

and the difference of y-axis of both points is stored in the variable **x**

.**y**

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