C

round decimal point in C

#include <math.h>

float val = 37.777779;

float rounded_down = floorf(val * 100) / 100;   /* Result: 37.77 */
float nearest = roundf(val * 100) / 100;  /* Result: 37.78 */
float rounded_up = ceilf(val * 100) / 100;      /* Result: 37.78 */

C float rounding up

#include <stdio.h>

int main (){
    float a;
    printf("
Enter a real number here please: ");
    scanf("%f",&a);
    
    printf("
Printing Number with different precision: ");
    printf("
  Number default precision: %f", a);
    printf("
  Number in (0 d.p.): %.0f", a);
    printf("
  Number in (1 d.p.): %.1f", a);
    printf("
  Number in (2 d.p.): %.2f", a);
    printf("
  Number in (3 d.p.): %.3f", a);
    printf("
  Number in (3 d.p.): %.4f", a);
    return 0;
}