# C++ Exercises: Check whether two straight lines AB and CD are orthogonal or not

## C++ Basic: Exercise-77 with Solution

There are four different points on a plane: A(x1, y1), B(x2, y2), C(x3, y3) and D(x4, y4).

Write a C++ program to check whether two straight lines AB and CD are orthogonal or not.

Input:

0 6

5 6

3 8

3 2

Output:

yes

**Pictorial Presentation:**

**Sample Solution**:

**C++ Code :**

```
#include <iostream>
using namespace std;
int main(void)
{
double x[4],y[4];
while(cin >> x[0] >> y[0]){
for(int i=1; i<4; i++){
cin >> x[i] >> y[i];
}
if( (x[1]-x[0])*(x[3]-x[2])+(y[3]-y[2])*(y[1]-y[0]) == 0 )
{
cout << "Yes, AB and CD are orthogonal." << endl;
}
else
{
cout << "Yes, AB and CD are not orthogonal." << endl;
}
}
return 0;
}
```

Sample Output:

Input number: 0 6 5 6 3 8 3 2 Yes, AB and CD are orthogonal.

**Flowchart: **

**C++ Code Editor:**

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**What is the difficulty level of this exercise?**

## C++ Programming: Tips of the Day

**Why is there no std::stou? **

The most pat answer would be that the C library has no corresponding "strtou", and the C++11 string functions are all just thinly veiled wrappers around the C library functions: The std::sto* functions mirror strto*, and the std::to_string functions use sprintf.

Ref: https://bit.ly/3wtz2qA

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