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  1. #include <stdio.h>
  2. #include <assert.h>
  3. #include <math.h>
  4.  
  5. long double round_f(long double number, int decimal_places)
  6. {
  7. 	assert(decimal_places > 0);
  8.  
  9. 	double power = pow(10, decimal_places-1);
  10. 	number *= power;
  11.  
  12. 	return (number >= 0) ? ((long long)(number + 0.5))/power : ((long long)(number - 0.5))/power;
  13. }
  14.  
  15. int main(void)
  16. {
  17. 	printf("%Lf\n", round_f(1.24, 2));
  18. 	printf("%Lf\n", round_f(1.25, 2));
  19. 	printf("%Lf\n", round_f(1.25, 1));
  20. 	printf("%Lf\n", round_f(1.55, 1));
  21.  
  22. 	return 0;
  23. }
  24.  
Success #stdin #stdout 0s 2008KB
comments ()
stdin 
Standard input is empty
stdout 
1.200000
1.300000
1.000000
2.000000
https://ideone.com/KSRylf
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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