在同一行，而不是新的更新值的printf [英] Update printf value on same line instead of new one

问题描述

我想知道是否有在 C 办法覆盖已打印，而不是创建一个新的行每一次，或只是动过现有值的空间。我需要从传感器获得的实时数据，并希望它只是坐在那里，并保持没有任何滚动更新现有值。这可能吗？

更新：增加了code

 的#include＆LT;＆stdio.h中GT;
＃包括LT＆;＆string.h中GT;
＃包括LT＆;＆errno.h中GT;
＃包括LT＆;＆unistd.h中GT;
＃包括LT＆;＆stdlib.h中GT;
＃包括LT＆;＆stdint.h GT;
＃包括LT＆;＆time.h中GT;＃包括LT＆;＆wiringPi.h GT;
＃包括LT＆;＆wiringPiI2C.h GT;CTRL_REG1的#define 0x20的
＃定义CTRL_REG2为0x21
＃定义CTRL_REG3 0x22
＃定义CTRL_REG4 0x23
INT的fd;
短X = 0;
短Y = 0;
短Z = 0;
诠释主（）{    FD = wiringPiI2CSetup（0×69）; //陀螺I2C地址
    wiringPiI2CWriteReg8（FD，CTRL_REG1，0x1F的）; //打开所有轴，禁用断电
    wiringPiI2CWriteReg8（FD，CTRL_REG3，0×08）; //启用控制就绪信号
    wiringPiI2CWriteReg8（FD，CTRL_REG4，0x80的）; //设置规模（500度/秒）
    延迟（200）; //等待同步无效getGyroValues​​（）{
    INT MSB，LSB;    LSB = wiringPiI2CReadReg8（FD，0x28）;
    MSB = wiringPiI2CReadReg8（FD，0x29）;
    X =（（MSB＆所述;＆下; 8）| LSB）;    MSB = wiringPiI2CReadReg8（FD，0x2B访问）;
    LSB = wiringPiI2CReadReg8（FD，0x2A）;
    Y =（（MSB＆所述;＆下; 8）| LSB）;    MSB = wiringPiI2CReadReg8（FD，0x2D）;
    LSB = wiringPiI2CReadReg8（FD，0x2C）设置;
    Z =（（MSB＆所述;＆下; 8）| LSB）;
}
    对（INT I = 0; I＆小于10;我++）{
    getGyroValues​​（）;
    //在114以下Divinding降低噪音
    的printf（X的数值为：％d个\\ r，即X / 114）;
//的printf（Y的值是：％D，Y / 114）;
//的printf（Z的值是：％d个\\ R，Z / 114）;
    INT T = wiringPiI2CReadReg8（FD，值为0x26）;
    T =（T * 1.8）+32; //摄氏转换到Fareinheit
    INT A = wiringPiI2CReadReg8（FD，0x2B访问）;
    INT B = wiringPiI2CReadReg8（FD，0x2A）;
//输出（Y_L等于数：％d \\ r，即一）;
//输出（Y_H等于数：％d \\ R，B）;
    INT C = wiringPiI2CReadReg8（FD，0x28）;
    INT D = wiringPiI2CReadReg8（FD，0x29）;
//输出（X_L等于数：％d \\ R，C）;
//输出（X_H等于数：％d \\ r，即D）;
    INT E = wiringPiI2CReadReg8（FD，0x2C）设置;
    INT F = wiringPiI2CReadReg8（FD，0x2D）;
//输出（Z_L等于数：％d \\ r，即E）;
//输出（Z_H等于数：％d \\ r，即F）;//的printf（温度为：％d个\\ R，T）;
    延迟（2000）;
}
};
 

解决方案

您可以打印出尽可能多的换行符控制台屏幕了。这将有效地清除屏幕。

这是有关以不同的方式清除屏幕很大链接。

I would like to know if there is a way in C to overwrite an existing value that has already been printed instead of creating a new line every time or just moving over a space. I need to obtain real time data from a sensor and would like it to just sit there and keep updating the existing values without any scrolling. Is this possible?

UPDATE: ADDED CODE

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <time.h>

#include <wiringPi.h>
#include <wiringPiI2C.h>

#define CTRL_REG1 0x20
#define CTRL_REG2 0x21
#define CTRL_REG3 0x22
#define CTRL_REG4 0x23


int fd;
short x = 0;
short y = 0;
short z = 0;
int main (){



    fd = wiringPiI2CSetup(0x69); // I2C address of gyro
    wiringPiI2CWriteReg8(fd, CTRL_REG1, 0x1F); //Turn on all axes, disable power down
    wiringPiI2CWriteReg8(fd, CTRL_REG3, 0x08); //Enable control ready signal
    wiringPiI2CWriteReg8(fd, CTRL_REG4, 0x80); // Set scale (500 deg/sec)
    delay(200);                    // Wait to synchronize

void getGyroValues (){
    int MSB, LSB;

    LSB = wiringPiI2CReadReg8(fd, 0x28);
    MSB = wiringPiI2CReadReg8(fd, 0x29);
    x = ((MSB << 8) | LSB);

    MSB = wiringPiI2CReadReg8(fd, 0x2B);
    LSB = wiringPiI2CReadReg8(fd, 0x2A);
    y = ((MSB << 8) | LSB);

    MSB = wiringPiI2CReadReg8(fd, 0x2D);
    LSB = wiringPiI2CReadReg8(fd, 0x2C);
    z = ((MSB << 8) | LSB);
}
    for (int i=0;i<10;i++){
    getGyroValues();
    // In following Divinding by 114 reduces noise
    printf("Value of X is: %d\r", x/114);
//  printf("Value of Y is: %d", y/114);
//  printf("Value of Z is: %d\r", z/114);
    int t = wiringPiI2CReadReg8(fd, 0x26);
    t = (t*1.8)+32;//convert Celcius to Fareinheit
    int a = wiringPiI2CReadReg8(fd,0x2B);
    int b = wiringPiI2CReadReg8(fd,0x2A);
//  printf("Y_L equals: %d\r", a);
//  printf("Y_H equals: %d\r", b);
    int c = wiringPiI2CReadReg8(fd,0x28);
    int d = wiringPiI2CReadReg8(fd,0x29);
//  printf("X_L equals: %d\r", c);
//  printf("X_H equals: %d\r", d);
    int e = wiringPiI2CReadReg8(fd,0x2C);
    int f = wiringPiI2CReadReg8(fd,0x2D);
//  printf("Z_L equals: %d\r", e);
//  printf("Z_H equals: %d\r", f); 

//  printf("The temperature is: %d\r", t); 
    delay(2000);
}
};

解决方案

You can print out as many newlines as the console screen has. This will effectively clear the screen.

This is a great link about clearing screen in different ways.

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