gistfile1.txt

#include <iostream>
#include <fstream>
#include <vector>
#include <chrono>
#include <thread>

struct Jiffies {
    int work, total;
};

Jiffies jiffies(){
    int work, total;
    std::ifstream cpu("/proc/stat");
    cpu.ignore(4, ' ');
    for (int i = 0; i < 10; ++i) {
        int value;
        cpu >> value;
        if(i < 3)
            work += value;
        total += value;
    }
    return {work, total};
} 

int main(){
    auto prev = jiffies();
    while(true) {
        std::this_thread::sleep_for(std::chrono::seconds(1));
        auto current = jiffies();
        float usage = (current.work - prev.work) * 1.0 / (current.total - prev.total);
        std::cout << usage * 100 << '\n';
        prev = current;
    }
}