Question

How to convert int array to int number in C

Answer 1

#include <stdio.h>

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];
	}

	printf("n = %d", n);

	return 0;
}




/*
run:

n = 463912

*/

 

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Answer 2

#include <stdio.h>

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]);

	printf("%d", IntArrayToIntNumber(arr, size));

	return 0;
}




/*
run:

463912

*/

 

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