Question

How to convert an array of digits to a 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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