Question

How to get the first and the last digit of a number in C++

Answer 1

#include <iostream>

int main() {
   int number = 87354;
 
    int firstDigit = number;
    while (firstDigit >= 10)  
        firstDigit /= 10; 
    std::cout << firstDigit << "\n";
  
    int lastDigit = number % 10;
    std::cout << lastDigit; 
}



/*
run:

8
4

*/

 

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Answer 2

#include <iostream>  
#include <cmath>  
   
int main() {  
    int n = 8405961;
    std::cout << "n: " << n << "\n";  
  
    int totaldigits_minusone = (int)log10(n); 
    int firstdigit = (int)(n / pow(10, totaldigits_minusone));
    std::cout << "firstdigit: " << firstdigit << "\n";  
     
    int lastdigit = n % 10;
    std::cout << "lastdigit: " << lastdigit << "\n";  
 
    return 0;
}  
   
   
   
   
/*
run:
   
n: 8405961
firstdigit: 8
lastdigit: 1
   
*/

 

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