C++ program to check if two arrays hold the same values:
In this post, we will learn how to check if two arrays are equal or not in C++. The program will take the numbers of each array as inputs from the user and print one message if both arrays are equal or not.
Algorithm to check if two arrays hold the same values:
The easiest way to solve this is by sorting both arrays and iterate them parallely. This approach is easy to implement and we can compare both arrays.
C++ program to check if two arrays hold same values:
Below is the complete C++ program:
#include <iostream>
#include <algorithm>
using namespace std;
bool compareArrays(int firstArray[], int secondArray[], int arraySize)
{
bool found;
sort(firstArray, firstArray + arraySize);
sort(secondArray, secondArray + arraySize);
for (int i = 0; i < arraySize; i++)
{
if (firstArray[i] != secondArray[i])
{
return false;
}
}
return true;
}
int main()
{
int arraySize;
cout << "Enter the size of the arrays :" << endl;
cin >> arraySize;
int firstArray[arraySize], secondArray[arraySize];
cout << "Enter the values for the first array :" << endl;
for (int i = 0; i < arraySize; i++)
{
cout << "Enter the value for index " << i + 1 << " : " << endl;
cin >> firstArray[i];
}
cout << "Enter the values for the second array :" << endl;
for (int i = 0; i < arraySize; i++)
{
cout << "Enter the value for index " << i + 1 << " : " << endl;
cin >> secondArray[i];
}
if (compareArrays(firstArray, secondArray, arraySize))
{
cout << "Both arrays are equal" << endl;
}
else
{
cout << "Both arrays are not equal" << endl;
}
}Explanation:
In this program,
- arraySize is used to hold the size of the array. Both arrays are of equal size.
- Using two for loops, we are reading the contents for the arrays. firstArray is used to hold the contents of the first array and secondArray for the second array.
- compareArrays method is used to compare two arrays. It takes two arrays and the array size and returns one boolean. true if both arrays are equal and false if not.
- compareArrays first sort both arrays and then using a for loop, it compares the contents of both arrays and returns false if any two values are not equal. If all are equal, then it returns true.
- Based on the result of compareArrays, we are printing one message that the arrays are equal or not.
Sample output:
It will give output as like below:
Enter the size of the arrays :
4
Enter the values for the first array :
Enter the value for index 1 :
1
Enter the value for index 2 :
2
Enter the value for index 3 :
3
Enter the value for index 4 :
4
Enter the values for the second array :
Enter the value for index 1 :
4
Enter the value for index 2 :
3
Enter the value for index 3 :
2
Enter the value for index 4 :
1
Both arrays are equal