Question

How to format a number with thousands separator (commas) in C

Answer 1

#include <stdio.h>
#include <locale.h>

int main() {
    long double ld = 28153056843;
    
    setlocale(LC_NUMERIC, "");
    
    printf("%'Lf", ld);

    return 0;
}
  
  

  
/*
run:
  
28,153,056,843.000000

*/

 

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