短进程优先调度算法c语言代码

以下是短进程优先调度算法的C语言代码实现：

#include <stdio.h>
#include <stdlib.h>

struct process {
    int pid; // 进程ID
    int arrival_time; // 到达时间
    int burst_time; // 执行时间
    int waiting_time; // 等待时间
    int turnaround_time; // 周转时间
    int status; // 进程状态，0表示未执行，1表示执行完毕
};

int main() {
    int n, i, j, smallest;
    float avg_waiting_time = 0, avg_turnaround_time = 0;
    printf("Enter the number of processes: ");
    scanf("%d", &n);
    struct process p[n], temp;
    for(i = 0; i < n; i++) {
        printf("Enter the arrival time and burst time of process %d: ", i+1);
        scanf("%d %d", &p[i].arrival_time, &p[i].burst_time);
        p[i].pid = i+1;
        p[i].status = 0;
    }
    // 对进程按照到达时间进行排序
    for(i = 0; i < n-1; i++) {
        for(j = 0; j < n-i-1; j++) {
            if(p[j].arrival_time > p[j+1].arrival_time) {
                temp = p[j];
                p[j] = p[j+1];
                p[j+1] = temp;
            }
        }
    }
    // 执行进程
    int current_time = 0, completed = 0, flag = 0;
    while(completed != n) {
        smallest = n-1;
        for(i = 0; i < n; i++) {
            if(p[i].arrival_time <= current_time && p[i].status == 0 && p[i].burst_time < p[smallest].burst_time) {
                smallest = i;
                flag = 1;
            }
        }
        if(flag == 0) {
            current_time++;
            continue;
        }
        p[smallest].waiting_time = current_time - p[smallest].arrival_time;
        p[smallest].turnaround_time = p[smallest].burst_time + p[smallest].waiting_time;
        current_time += p[smallest].burst_time;
        p[smallest].status = 1;
        completed++;
        avg_waiting_time += p[smallest].waiting_time;
        avg_turnaround_time += p[smallest].turnaround_time;
        flag = 0;
    }
    // 输出结果
    printf("PID\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n");
    for(i = 0; i < n; i++) {
        printf("%d\t%d\t\t%d\t\t%d\t\t%d\n", p[i].pid, p[i].arrival_time, p[i].burst_time, p[i].waiting_time, p[i].turnaround_time);
    }
    avg_waiting_time /= n;
    avg_turnaround_time /= n;
    printf("Average Waiting Time: %.2f\n", avg_waiting_time);
    printf("Average Turnaround Time: %.2f\n", avg_turnaround_time);
    return 0;
}

在该实现中，首先通过结构体定义了进程的属性，然后通过用户输入初始化了进程数组。接着对进程按照到达时间进行排序，然后循环执行进程，选择剩余执行时间最短的进程进行执行。在执行完毕后计算每个进程的等待时间和周转时间，并输出结果。最后计算平均等待时间和平均周转时间输出。