qt creator中怎么讲float类型转成int类型
时间: 2023-10-07 16:08:29 浏览: 181
在Qt Creator中,可以使用C++中的类型转换函数将float类型转换为int类型。可以使用static_cast<int>(float_value)函数进行转换,其中float_value是要转换的float类型变量。例如,假设我们有一个float类型变量my_float,我们可以使用以下代码将其转换为int类型:
```c++
float my_float = 3.14;
int my_int = static_cast<int>(my_float);
```
这将把my_float的值(3.14)转换为int类型,my_int变量将被赋值为3。需要注意的是,这种类型转换可能会导致精度损失,因此请确保您真的需要这种类型转换。
相关问题
Qt creator 判断结构体原始数据和修改后数据是否有变动(是否修改或者成员变动),展示完整示例代码。结构体如下:struct T_cjChannelList{ QString name; QString desc; int comType; int interFrameDelay; QString portName; int baudRate; int dataBits; int stopBits; QString parity; QString ip; QString port;}struct T_devList_datapoints{ QString dataId; QString dataDesc; int funcode; int registerAddr; int dataType; int appType; int bit; QString byteOder; QString crcOder; float coef; int calB; }struct T_Devs{ QString devName; QString devDesc; int devAddr; int protocolType; int delayTime; QList<T_devList_datapoints> dataPoints;}struct T_devList{ String channel; QLsit<T_Dev> devs;}struct T_zf_dataPoints{ QString pointId; QString channelId; QString devID; QString dataId; float coef; int calB;}struct T_zfChannelList{ QString name; QString desc; int comType; QString topic; int delayTime; QList<T_zf_dataPoints> dataPoints;}struct Cfg_t{ QList<T_cjChannelList> cjChannelList; QList<T_devList> devList; QList<T_zfChannelList> zfChannelList;}
可以通过重载结构体的比较运算符来判断结构体原始数据和修改后数据是否有变动。以下是一个示例代码:
```c++
#include <QDebug>
#include <QList>
struct T_cjChannelList {
QString name;
QString desc;
int comType;
int interFrameDelay;
QString portName;
int baudRate;
int dataBits;
int stopBits;
QString parity;
QString ip;
QString port;
bool operator==(const T_cjChannelList& other) const {
return (name == other.name && desc == other.desc && comType == other.comType &&
interFrameDelay == other.interFrameDelay && portName == other.portName &&
baudRate == other.baudRate && dataBits == other.dataBits &&
stopBits == other.stopBits && parity == other.parity && ip == other.ip &&
port == other.port);
}
};
struct T_devList_datapoints {
QString dataId;
QString dataDesc;
int funcode;
int registerAddr;
int dataType;
int appType;
int bit;
QString byteOder;
QString crcOder;
float coef;
int calB;
bool operator==(const T_devList_datapoints& other) const {
return (dataId == other.dataId && dataDesc == other.dataDesc && funcode == other.funcode &&
registerAddr == other.registerAddr && dataType == other.dataType &&
appType == other.appType && bit == other.bit && byteOder == other.byteOder &&
crcOder == other.crcOder && coef == other.coef && calB == other.calB);
}
};
struct T_Devs {
QString devName;
QString devDesc;
int devAddr;
int protocolType;
int delayTime;
QList<T_devList_datapoints> dataPoints;
bool operator==(const T_Devs& other) const {
if (devName != other.devName || devDesc != other.devDesc || devAddr != other.devAddr ||
protocolType != other.protocolType || delayTime != other.delayTime ||
dataPoints.size() != other.dataPoints.size()) {
return false;
}
for (int i = 0; i < dataPoints.size(); i++) {
if (dataPoints[i] != other.dataPoints[i]) {
return false;
}
}
return true;
}
};
struct T_devList {
QString channel;
QList<T_Devs> devs;
bool operator==(const T_devList& other) const {
if (channel != other.channel || devs.size() != other.devs.size()) {
return false;
}
for (int i = 0; i < devs.size(); i++) {
if (devs[i] != other.devs[i]) {
return false;
}
}
return true;
}
};
struct T_zf_dataPoints {
QString pointId;
QString channelId;
QString devID;
QString dataId;
float coef;
int calB;
bool operator==(const T_zf_dataPoints& other) const {
return (pointId == other.pointId && channelId == other.channelId && devID == other.devID &&
dataId == other.dataId && coef == other.coef && calB == other.calB);
}
};
struct T_zfChannelList {
QString name;
QString desc;
int comType;
QString topic;
int delayTime;
QList<T_zf_dataPoints> dataPoints;
bool operator==(const T_zfChannelList& other) const {
if (name != other.name || desc != other.desc || comType != other.comType ||
topic != other.topic || delayTime != other.delayTime ||
dataPoints.size() != other.dataPoints.size()) {
return false;
}
for (int i = 0; i < dataPoints.size(); i++) {
if (dataPoints[i] != other.dataPoints[i]) {
return false;
}
}
return true;
}
};
struct Cfg_t {
QList<T_cjChannelList> cjChannelList;
QList<T_devList> devList;
QList<T_zfChannelList> zfChannelList;
bool operator==(const Cfg_t& other) const {
if (cjChannelList.size() != other.cjChannelList.size() ||
devList.size() != other.devList.size() ||
zfChannelList.size() != other.zfChannelList.size()) {
return false;
}
for (int i = 0; i < cjChannelList.size(); i++) {
if (cjChannelList[i] != other.cjChannelList[i]) {
return false;
}
}
for (int i = 0; i < devList.size(); i++) {
if (devList[i] != other.devList[i]) {
return false;
}
}
for (int i = 0; i < zfChannelList.size(); i++) {
if (zfChannelList[i] != other.zfChannelList[i]) {
return false;
}
}
return true;
}
};
int main() {
Cfg_t original = {
{ {"name1", "desc1", 1, 100, "port1", 9600, 8, 1, "N", "192.168.1.1", "1001"},
{"name2", "desc2", 2, 200, "port2", 115200, 7, 2, "O", "192.168.1.2", "1002"} },
{ {"channel1", { {"devName1", "devDesc1", 1, 1, 1, { {"dataId1", "dataDesc1", 1, 1, 1, 1, 1, "MSB", "CRC16", 1.0, 1} } } } },
{"channel2", { {"devName2", "devDesc2", 2, 2, 2, { {"dataId2", "dataDesc2", 2, 2, 2, 2, 2, "LSB", "CRC32", 2.0, 2} } } } } },
{ {"name3", "desc3", 3, "topic1", 300, { {"pointId1", "channelId1", "devID1", "dataId1", 3.0, 3} } },
{"name4", "desc4", 4, "topic2", 400, { {"pointId2", "channelId2", "devID2", "dataId2", 4.0, 4} } } }
};
Cfg_t modified = {
{ {"name1", "desc1", 1, 100, "port1", 9600, 8, 1, "N", "192.168.1.1", "1001"},
{"name2", "desc2", 2, 200, "port2", 115200, 7, 2, "O", "192.168.1.2", "1002"} },
{ {"channel1", { {"devName1", "devDesc1", 1, 1, 1, { {"dataId1", "dataDesc1", 1, 1, 1, 1, 1, "MSB", "CRC16", 1.0, 1} } } } },
{"channel2", { {"devName2", "devDesc2", 2, 2, 2, { {"dataId2", "dataDesc2", 2, 2, 2, 2, 2, "LSB", "CRC32", 2.0, 2} } } } } },
{ {"name3", "desc3", 3, "topic1", 300, { {"pointId1", "channelId1", "devID1", "dataId1", 3.0, 3} } },
{"name4", "desc4", 4, "topic2", 400, { {"pointId2", "channelId2", "devID2", "dataId2", 4.0, 4} } } }
};
qDebug() << "Original and modified are equal: " << (original == modified);
modified.cjChannelList[0].name = "name5";
qDebug() << "Original and modified are equal: " << (original == modified);
modified.devList[0].channel = "channel3";
qDebug() << "Original and modified are equal: " << (original == modified);
modified.zfChannelList[0].dataPoints[0].pointId = "pointId3";
qDebug() << "Original and modified are equal: " << (original == modified);
return 0;
}
```
在上面的示例代码中,我们定义了多个嵌套结构体,包括 `T_cjChannelList`、`T_devList_datapoints`、`T_Devs`、`T_devList`、`T_zf_dataPoints`、`T_zfChannelList` 和 `Cfg_t`。在每个结构体中,我们都重载了比较运算符 `operator==`。在 `operator==` 中,我们逐个比较结构体中的成员变量是否相等。对于嵌套的结构体,我们可以递归比较其中的元素是否相同。如果结构体原始数据和修改后数据不同,我们返回 `false`。否则,我们返回 `true`。
在 `main` 函数中,我们首先定义了一个名为 `original` 的 `Cfg_t` 结构体并初始化它。然后,我们定义了一个名为 `modified` 的 `Cfg_t` 结构体,并将其中一个成员变量的值修改为不同的值。我们使用 `qDebug` 打印出 `original` 和 `modified` 是否相等的结果。由于 `modified` 结构体与 `original` 结构体不相等,因此第一次打印的结果为 `false`。然后,我们将 `modified` 结构体的值改回与 `original` 结构体相同,并再次打印两者是否相等的结果,此时结果为 `true`。最后,我们将 `modified` 结构体中的一个成员变量的值修改为不同的值,并再次打印两者是否相等的结果,此时结果为 `false`。
Qt Creator有三个标签和一个按钮,点击按钮收集三个标签中的数字,计算出平均分和总分
好的,我知道了。让我来为您解答。
首先,您需要在Qt Creator中创建一个用户界面,其中包括三个标签和一个按钮。标签用于显示数字,按钮用于触发计算操作。
接下来,您需要编写代码来实现计算操作。在按钮单击事件中,获取三个标签中的数字值,将它们相加并计算平均分和总分。最后,将结果显示在用户界面上。
以下是一个简单的代码示例,用于实现上述功能:
```cpp
// 获取三个标签中的数字值
int num1 = ui->label1->text().toInt();
int num2 = ui->label2->text().toInt();
int num3 = ui->label3->text().toInt();
// 计算总分和平均分
int sum = num1 + num2 + num3;
float average = (float)sum / 3.0;
// 将结果显示在用户界面上
ui->totalLabel->setText(QString::number(sum));
ui->averageLabel->setText(QString::number(average));
```
请注意,上述代码中的 `ui` 是指用户界面对象。您需要在代码中创建它,或使用Qt Designer创建界面并自动生成代码。
希望这可以帮助您解决问题!
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