Linux C++ 终端进度条

Linux终端控制字符 \r 可以清空当前行的内容
"\33[3A" 终端光标向上移动三行，并清空后面的内容

#include <string>
#include <iostream>
#include <unistd.h>
#include <iomanip>
using namespace std;

// a,b,c表示进度，为0-1之间的小数
void refresh(float a, float b, float c)
{
    if (a > 1)
        a = 1;
    if (b > 1)
        b = 1;
    if (c > 1)
        c = 1;
    // 整体放大
    int pa = a * 50;
    int pb = b * 50;
    int pc = c * 50;
    cout << "\33[3A"; // 终端光标向上移动三行
    cout << "[" + string(pa, '=') + ">" + string(50 - pa, ' ') << "]  " << a*100 << "%" << endl;
    cout << "[" + string(pb, '=') + ">" + string(50 - pb, ' ') << "]  " << b*100 << "%" << endl;
    cout << "[" + string(pc, '=') + ">" + string(50 - pc, ' ') << "]  " << c*100 << "%" << endl;
    fflush(stdout); // 刷新缓冲区
}

int main()
{
    cout << "\n\n\n";
    cout << setiosflags(ios::fixed) << setprecision(2);
    float a=0,  b=0, c=0;
    for(int i = 0; i <= 100; i++)
    {
        a += 0.01;
        b += 0.02;
        c += 0.03;
        refresh(a,b,c);
        usleep(1000 * 100);
    }
    return 0;
}