自写~模拟操作系统进程调度C语言，按优先级

#include<stdio.h>
#include<string.h>
#define MAX 10
typedef struct process {
    char name[10];
    int priority;
    int ReachTime;
    int NeedTime;
    int UsedTime;
    char state;
}PCB;
int n=0;
int pTime;
PCB static pcbs[MAX];

void sort(){
    int i,j;
    PCB pcb;

    for(i=0;i<n;i++){
        for(j=n-2;j>=i;j--){
            if(pcbs[j+1].ReachTime < pcbs[j].ReachTime) {
                pcb = pcbs[j];
                pcbs[j] = pcbs[j+1];
                pcbs[j+1] = pcb;
            }
        }
    }


    for(i=0;i<n;i++){
        for(j=n-2;j>=i;j--){
            if(pcbs[j+1].priority > pcbs[j].priority) {
                pcb = pcbs[j];
                pcbs[j] = pcbs[j+1];
                pcbs[j+1] = pcb;
            }
        }
    }


    if(pcbs[0].state!='F') {
        pcbs[0].state='R';
    }

}
void print(){
    int i;
    sort();
    printf("\n 进程名 | 优先级 |到达时间|需要时间|已用时间|进程状态  \n");
    for(i=0;i<n;i++){
        printf("%8s%8d%8d%8d%8d%8c\n",pcbs[i].name,pcbs[i].priority,pcbs[i].ReachTime,pcbs[i].NeedTime,pcbs[i].UsedTime,pcbs[i].state);
    }
}
void AddProcess(){
    PCB i;
    char ch;
     while(1){
        printf("\n请输入进程名：");
        scanf("%s",&(i.name));
        printf("请输入进程优先级：");
        scanf("%d",&(i.priority));
        printf("请输入需要运行时间：");
        scanf("%d",&(i.NeedTime));

        i.ReachTime = n;
        i.UsedTime = 0;
        i.state = 'W';
        pcbs[n] = i;
        n++;

        printf("你是否还要继续添加？");

        do {
            scanf("%c",&ch);
        }while(ch==' ' || ch=='\n');

        if(ch != 'y')
            break;
    }
    printf("\n添加进程完毕\n");
}

void attemper(){
    do {
        if( pcbs[0].NeedTime - pcbs[0].UsedTime > pTime) {
            pcbs[0].UsedTime += pTime;
            pcbs[0].priority--;
            pcbs[0].state = 'W';
        } else {
            pcbs[0].UsedTime = pcbs[0].NeedTime;
            pcbs[0].priority = -1;
            pcbs[0].state = 'F';
        }
        print();
    }while(pcbs[0].state!='F');
}
void face(){
    char ch;
    do{
        printf("\n增加进程并调度，请按1");
        printf("\n打印进程，请按2");
        printf("\n任务结束，请按0");
        printf("\n请选择：");
        do{
           scanf("%c",&ch);
        }while(ch == ' ' || ch =='\n');

        switch(ch){
            case '1':
                AddProcess();
                print();
                attemper();
                break;
            case '2':
                print();
                break;
            case '0':break;
        }
    }while(ch!='0');
}

int main(){
    printf("\n请设置时间片大小：");
    scanf("%d",&pTime);
    face();
    return 0;
}