Округление числа в C++Builder

numC = pow(numA, numB);
 
C->Text=FloatToStr(numC);

float f1=1.2345678;
float f2=f1*100+0.5;
int i1=f2;
f1=(float)i1/100.0;

sprintf(buf, "%.2f",numC);
C->Text=buf;

numC = pow(numA, numB);
 
C->Text=FormatFloat("0.000", numC);

#include <stdio.h>
#include <windows.h>
int  main()
{
float f1=1.236567;
float f2=f1*100+0.5;
int i1=f2;
f2=i1/100.0;
printf("float \n");
 
printf("f1=%.2f \n",f1);
printf("f2(f) =%f \n",f2);
printf("f2(f.10)=%.10f \n",f2);
 
float f3=0.001;
float f4=0,f5=0,f6=0;
for(int i=0;i<1000000;i++)
{
 f4+=f3; 
}
for(int i=0;i<1000000;i++)
{
 f5+=f3; 
 f6=f5*1000+0.5;
 i1=f6;
 f5=i1/1000.0;
 
}
 
printf("f4=%f \n",f4);
printf("f5=%f \n",f5);
printf(" \n=====================\n");
printf("double \n");
double d1=1.236567;
double d2=d1*100+0.5;
int i2=d2;
d2=i2/100.0;
 
printf("d1=%.2f \n",d1);
printf("d2(f)=%f \n",d2);
printf("d2(f.10)=%.010f \n",d2);
double d3=0.001;
double d4=0,d5=0,d6=0;
for(int i=0;i<1000000;i++)
{
 d4+=d3; 
}
for(int i=0;i<1000000;i++)
{
 d5+=d3; 
 d6=d5*1000+0.5;
 i2=d6;
 d5=i1/1000.0;
 
}
 
printf("d4=%f \n",d4);
printf("d5=%f \n",d5);
 
system("pause");
 }

for(int i=0;i<1000000;i++)
{
 f4+=f3; 
}