Question

How to get the first two digits of int number in C++

Answer 1

#include <iostream>  

   
int main() {  
    int n = 840172;  
       
    std::cout << n << "\n";  
       
    int tmp = n, first_two_digits = n; 
    while (n) {
        first_two_digits = tmp;
        tmp = n;
        n /= 10;
    }   
         
    std::cout << first_two_digits;  
       
    return 0;
}  
   
   
   
   
/*
run:
   
840172
84
   
*/

 

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Answer 2

#include <iostream>  
#include <cmath> 
   
int main() {  
    int n = 840172;  
       
    std::cout << n << "\n";  
       
    int totaldigits_minustwo = (int)log10(n) - 1; 
  
    int first_two_digits = (int)(n / pow(10, totaldigits_minustwo));
         
    std::cout << first_two_digits;  
       
    return 0;
}  
   
   
   
   
/*
run:
   
840172
84
   
*/

 

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