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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int pow_i(int base, int exp){
  5.     int result = 1;
  6.     while (exp){
  7.         if (exp & 1)
  8.             result *= base;
  9.         exp >>= 1;
  10.         base *= base;
  11.     }
  12.     return result;
  13. }
  14.  
  15. float round_float_precision(float x, unsigned digits){
  16. 	unsigned precision = pow_i(10, digits);
  17. 	return roundf(x*precision)/precision;
  18. }
  19.  
  20. int main(void) {
  21. 	float x = 123.456;
  22. 	printf("Two digits of precision\n");
  23. 	printf("- by printf                  - %.2f\n", x);
  24. 	printf("- by setting value precision - %f\n", round_float_precision(x, 2));
  25. 	return 0;
  26. }
  27.  
Success #stdin #stdout 0s 2292KB
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stdin
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Standard input is empty
stdout
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Two digits of precision
- by printf                  - 123.46
- by setting value precision - 123.460000
https://ideone.com/VmRrgp
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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