Question

How to convert int array to int number in C++

Answer 1

#include <iostream>

int main() {
    int arr[] = {4, 6, 3, 9, 1, 2};
    int size = sizeof(arr)/sizeof(arr[0]);
    
	int n = 0;
	for (int i = 0; i < size; i++) {
		 n = n * 10 + arr[i];
	}

	std::cout << "n = " << n;
}




/*
run:

n = 463912

*/

 

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Answer 2

#include <iostream>
 
int IntArrayToIntNumber(int arr[], int size) {
	int n = 0;

	for (int i = 0; i < size; i++) {
		n = n * 10 + arr[i];
	}

	return n;
}

int main() {
    int arr[] = {4, 6, 3, 9, 1, 2};
    int size = sizeof(arr)/sizeof(arr[0]);

    std::cout << IntArrayToIntNumber(arr, size);
}
 
 
 
 
/*
run:
 
463912
 
*/

 

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