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Code: Select all

    cout << "\nround with implicit cast from 0.1 double " << lroundf(0.1);
    cout << "\nround with implicit cast from 0.9 double " << lroundf(0.9);
    cout << "\nround with explicit cast from double " << lroundf((float)0.9);
    cout << "\nround with float "<<lroundf(0.9f);

Code: Select all

#include "predef.h"
#include <stdio.h>
#include <ctype.h>
#include <startnet.h>
#include <autoupdate.h>
#include <dhcpclient.h>
#include <smarttrap.h>
#include <taskmon.h>
#include <NetworkDebug.h>

#include <math.h>

extern "C" {
void UserMain(void * pd);
}

const char * AppName="test_MOD5270B";


void tst_fplib(float tv)
{
	double dtv = (double)(tv);

	printf("\nf=%f\n", dtv);

	long int li = lroundf(tv);
	printf("lroundf(f) = %ld\n", li);
	li = lround(dtv);
	printf("lround(f) = %ld\n\n", li);

}
void test_float_point_libs(void)
{
	tst_fplib(0.9f);
	tst_fplib(0.5f);
	tst_fplib(0.1f);
	tst_fplib(-0.9f);
	tst_fplib(-0.5f);
	tst_fplib(-0.1f);

}




void UserMain(void * pd) {
    InitializeStack();
    if (EthernetIP == 0) GetDHCPAddress();
    OSChangePrio(MAIN_PRIO);
    EnableAutoUpdate();
    StartHTTP();
    EnableTaskMonitor();

    #ifndef _DEBUG
    EnableSmartTraps();
    #endif

    #ifdef _DEBUG
    InitializeNetworkGDB_and_Wait();
    #endif

    iprintf("Application started\n");

    test_float_point_libs();

    while (1) {
        OSTimeDly(20);
    }
}

Code: Select all

void do_nothing (float& myfloat)
{
    cout << "No call to the rounding funcs "<< myfloat;
}

Code: Select all

    float new_float = 0.9f;
    cout << "\nBEFORE  "<< new_float<< "result:" << lroundf(new_float) <<"\n";
    do_nothing(new_float);
    cout << "\nAFTER do_nothing() lroundf of "<< new_float<< "result:" << lroundf(new_float) <<"\n";