Question

我有这个程序（c ++）在while循环中计算两个变量值。我正在尝试在文本文件中写入这些值。现在我想在文本文件的一行中写出 lforce 变量的5个值，在另一行中写出 rforce 变量的5个值。我怎么能这样做？

int i = 5;
int a2dVal = 0; 
int a2dChannel = 0;
unsigned char data[3];
float g = 9.8;
int fsensor1;
int fsensor2;
int fsensor3;
int fsensor4;
int fsensor5;
int fsensor6;   
float vsensor;
int lforce;
int rforce; 
float vref = 2.5;
float vin = 3.3;

ofstream myfile ("/var/www/html/Sensors/all.txt");


if (myfile.is_open())
{

    while(i > 0)
    {
        data[0] = 1;  //  first byte transmitted -> start bit
        data[1] = 0b1000000000 |( ((a2dChannel & 9) << 4)); // second byte    transmitted -> (SGL/DIF = 1, D2=D1=D0=0)
        data[2] = 0; // third byte transmitted....don't care

        a2d.spiWriteRead(data, sizeof(data) );

        a2dVal = 0;
                a2dVal = (data[1]<< 10) & 0b110000000000; //merge data[1] & data[2] to get result
                a2dVal |=  (data[2] & 0x0f);
        sleep(1);

        vsensor = (vref*a2dVal)/1024;

        fsensor1 = ((vsensor/0.1391)-0.0329)*g;
        fsensor2 = ((vsensor/0.1298)+0.1321)*g;
        fsensor3 = ((vsensor/0.1386)+0.0316)*g;
        fsensor4 = ((vsensor/0.1537)-0.0524)*g;
        fsensor5 = ((vsensor/0.1378)+0.0922)*g;
        fsensor6 = ((vsensor/0.1083)-0.0096)*g;

        lforce = fsensor4 + fsensor5 + fsensor6;
        rforce = fsensor1 + fsensor2 + fsensor3;

        cout << lforce << " ";
        cout << rforce << " ";

        i--;    

    }

    myfile << lforce << " " << rforce << " "; // here I want to write the variables in different lines of the text file


    }

    myfile.close();


    return 0;
}

Answer 1

如果您想通过操作文件光标来执行此操作，则可以使用fseek和rewind功能。但是我觉得创建2个数组并做一些像这样的事情是非常困难和容易的：

lforce = fsensor4 + fsensor5 + fsensor6;
lforceArray[5-i] = lforce;
rforce = fsensor1 + fsensor2 + fsensor3;
rforceArray[5-i] = rforce;

然后将这些数组写入文件。

如何从一行中的一个变量和另一行中另一个变量的所有值中输出所有值？

1 个答案: