Program to find slope of a line

Given two coordinates, find the slope of a straight line.

Examples:

Input :x1 = 4, y1 = 2, x2 = 2, y2 = 5Output :Slope is -1.5

**Approach:** To calculate the slope of a line you need only two points from that line, (x1, y1) and (x2, y2). The equation used to calculate the slope from two points is:

*Below is the implementation of the above approach:*

## C++

`// C++ program for slope of line` `#include <bits/stdc++.h>` `using` `namespace` `std;` `// function to find the slope of a straight line` `float` `slope(` `float` `x1, ` `float` `y1, ` `float` `x2, ` `float` `y2)` `{` ` ` `return` `(y2 - y1) / (x2 - x1);` `}` `// driver code to check the above function` `int` `main()` `{` ` ` `float` `x1 = 4, y1 = 2;` ` ` `float` `x2 = 2, y2 = 5;` ` ` `cout << ` `"Slope is: "` ` ` `<< slope(x1, y1, x2, y2);` ` ` `return` `0;` `}` |

## Java

`// Java program for slope of line` `import` `java.io.*;` `class` `GFG {` ` ` `static` `float` `slope(` `float` `x1, ` `float` `y1,` ` ` `float` `x2, ` `float` `y2)` ` ` `{` ` ` `return` `(y2 - y1) / (x2 - x1);` ` ` `}` ` ` `public` `static` `void` `main(String[] args)` ` ` `{` ` ` `float` `x1 = ` `4` `, y1 = ` `2` `;` ` ` `float` `x2 = ` `2` `, y2 = ` `5` `;` ` ` `System.out.println(` `"Slope is "` `+` ` ` `slope(x1, y1, x2, y2));` ` ` `}` `}` |

## Python

`# Python program for slope of line` `def` `slope(x1, y1, x2, y2):` ` ` `return` `(` `float` `)(y2` `-` `y1)` `/` `(x2` `-` `x1)` `# driver code ` `x1 ` `=` `4` `y1 ` `=` `2` `x2 ` `=` `2` `y2 ` `=` `5` `print` `"Slope is :"` `, slope(x1, y1, x2, y2)` |

## C#

`// C# program for slope of line` `using` `System;` `class` `GFG` `{` ` ` `static` `float` `slope(` `float` `x1, ` `float` `y1,` ` ` `float` `x2, ` `float` `y2)` ` ` `{` ` ` `return` `(y2 - y1) / (x2 - x1);` ` ` `}` ` ` ` ` `// Driver code` ` ` `public` `static` `void` `Main()` ` ` `{` ` ` `float` `x1 = 4, y1 = 2;` ` ` `float` `x2 = 2, y2 = 5;` ` ` `Console.WriteLine(` `"Slope is "` `+` ` ` `slope(x1, y1, x2, y2));` ` ` `}` `}` `// This code is contributed by vt_m.` |

## PHP

`<?php` `// PHP program for` `// slope of line` `// function to find the` `// slope of a straight line` `function` `slope(` `$x1` `, ` `$y1` `, ` `$x2` `, ` `$y2` `)` `{` ` ` `return` `(` `$y2` `- ` `$y1` `) /` ` ` `(` `$x2` `- ` `$x1` `);` `}` ` ` `// Driver Code` ` ` `$x1` `= 4;` ` ` `$y1` `= 2;` ` ` `$x2` `= 2;` ` ` `$y2` `= 5;` ` ` `echo` `"Slope is: "` ` ` `, slope(` `$x1` `, ` `$y1` `,` ` ` `$x2` `, ` `$y2` `);` `// This code is contributed by anuj_67.` `?>` |

## Javascript

`<script>` `// javascript program for slope of line` ` ` `function` `slope(x1, y1,` ` ` `x2, y2)` ` ` `{` ` ` `return` `(y2 - y1) / (x2 - x1);` ` ` `}` `// Driver code` ` ` `let x1 = 4, y1 = 2;` ` ` `let x2 = 2, y2 = 5;` ` ` `document.write(` `"Slope is "` `+` ` ` `slope(x1, y1, x2, y2));` ` ` ` ` `// This code is contributed by susmitakundugoaldanga.` `</script>` |

**Output**

Slope is: -1.5

**Time Complexity: **O(1)

**Auxiliary Space: **O(1)

** Special Case:** The above code will throw a runtime error when int the function x1 is equal to x2 (x1==x2). In that case, our denominator will become zero(0). To avoid that condition, we will add a condition in the slope function.

## C++

`// C++ program for slope of line` `#include <bits/stdc++.h>` `using` `namespace` `std;` `// function to find the slope of a straight line` `float` `slope(` `float` `x1, ` `float` `y1, ` `float` `x2, ` `float` `y2)` `{` ` ` `if` `(x1 == x2)` ` ` `return` `INT_MAX;` ` ` `return` `(y2 - y1) / (x2 - x1);` `}` `// driver code to check the above function` `int` `main()` `{` ` ` `float` `x1 = 4, y1 = 2;` ` ` `float` `x2 = 2, y2 = 5;` ` ` `cout << ` `"Slope is: "` ` ` `<< slope(x1, y1, x2, y2);` ` ` `return` `0;` `}` |

## Java

`// Java program for slope of line` `import` `java.util.*;` `class` `GFG {` ` ` `// function to find the slope of a straight line` ` ` `static` `float` `slope(` `float` `x1, ` `float` `y1, ` `float` `x2, ` `float` `y2) {` ` ` `if` `(x1 == x2)` ` ` `return` `Integer.MAX_VALUE;` ` ` `return` `(y2 - y1) / (x2 - x1);` ` ` `}` ` ` `// driver code to check the above function` ` ` `public` `static` `void` `main(String[] args) {` ` ` `float` `x1 = ` `4` `, y1 = ` `2` `;` ` ` `float` `x2 = ` `2` `, y2 = ` `5` `;` ` ` `System.out.print(` `"Slope is: "` `+ slope(x1, y1, x2, y2));` ` ` `}` `}` `// This code contributed by Rajput-Ji` |

## Javascript

`<script>` `// javascript program for slope of line` `// function to find the slope of a straight line` ` ` `function` `slope(x1 , y1 , x2 , y2) {` ` ` `if` `(x1 == x2)` ` ` `return` `Number.MAX_VALUE;` ` ` `return` `(y2 - y1) / (x2 - x1);` ` ` `}` ` ` `// driver code to check the above function ` ` ` `var` `x1 = 4, y1 = 2;` ` ` `var` `x2 = 2, y2 = 5;` ` ` `document.write(` `"Slope is: "` `+ slope(x1, y1, x2, y2));` `// This code is contributed by Rajput-Ji` `</script>` |

**Output**

Slope is: -1.5

**Time Complexity:** O(1)

**Auxiliary Space:** O(1)