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float sayi_float;
int sayi_int;
sayi_float*=100;
sayi_int=(int)(sayi_float+0.5);
sayi_float=sayi_int/100;

#include<stdio.h>
#include<math.h>

int main () {
    
    double f = 3.12656;

    double int_part;
    
    double fractional = modf(f, &int_part);
    
    fractional = fractional * 100;
    
    fractional = round(fractional);
    
    fractional = fractional / 100;
    
    f = fractional + int_part;
    
    printf("\r\n Last State of f : %lf", f);    
    
    return(0);
}

float round(float var) 
{ 
    // we use array of chars to store number 
    // as a string. 
    char str[40];  
  
    // Print in string the value of var  
    // with two decimal point 
    sprintf(str, "%.2f", var); 
  
    // scan string value in var  
    sscanf(str, "%f", &var);  
  
    return var;  
}

float sayi_float;
int sayi_int;
sayi_float=3.126;
sayi_float*=100;
sayi_int=(int)(sayi_float+0.5);
sayi_float=((float)sayi_int)/100;