Question

How to truncate a number from left in C++

Answer 1

#include <iostream>
#include <cmath>
 
int truncate_left(int num) {
    int total = (int)log10(num); // total - 1 = 3
     
    int first_digit = num / pow(10, (total));
     
    return num - first_digit * pow(10, (total));
}
  
int main(void) {
    int num = 7483;
 
    std::cout << truncate_left(num);
}
  
  
  
  
/*
run:
      
483
      
*/

 

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