请多用函数
时间: 2023-11-11 22:05:37 浏览: 44
好的,以下是使用函数的简单轮转法进程调度程序的示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#define MAX_PROCESS 5
#define TIME_SLICE 2
struct process {
int pid;
int burst_time;
int remaining_time;
int waiting_time;
int turnaround_time;
int completed;
};
typedef struct process Process;
void init_processes(Process processes[]) {
int i;
for (i = 0; i < MAX_PROCESS; i++) {
processes[i].pid = i + 1;
printf("请输入进程 %d 的运行时间:", i + 1);
scanf("%d", &processes[i].burst_time);
processes[i].remaining_time = processes[i].burst_time;
processes[i].waiting_time = 0;
processes[i].turnaround_time = 0;
processes[i].completed = 0;
}
}
void run_process(Process *process) {
int i;
printf("正在运行进程 %d,剩余时间 %d\n", process->pid, process->remaining_time);
for (i = 0; i < TIME_SLICE; i++) {
process->remaining_time--;
if (process->remaining_time == 0) {
process->completed = 1;
break;
}
}
if (process->completed) {
printf("进程 %d 运行完毕\n", process->pid);
} else {
printf("时间片用完,进程 %d 被挂起\n", process->pid);
}
}
int is_all_completed(Process processes[]) {
int i;
for (i = 0; i < MAX_PROCESS; i++) {
if (!processes[i].completed) {
return 0;
}
}
return 1;
}
void calculate_waiting_time(Process *processes) {
int i;
int time = 0;
for (i = 0; i < MAX_PROCESS; i++) {
processes[i].waiting_time = time;
time += processes[i].burst_time;
}
}
void calculate_turnaround_time(Process *processes) {
int i;
for (i = 0; i < MAX_PROCESS; i++) {
processes[i].turnaround_time = processes[i].waiting_time + processes[i].burst_time;
}
}
void print_result(Process *processes) {
int i;
printf("\n进程\t等待时间\t周转时间\n");
for (i = 0; i < MAX_PROCESS; i++) {
printf("%d\t%d\t%d\n", processes[i].pid, processes[i].waiting_time, processes[i].turnaround_time);
}
}
int main() {
Process processes[MAX_PROCESS];
int i;
init_processes(processes);
while (!is_all_completed(processes)) {
for (i = 0; i < MAX_PROCESS; i++) {
if (!processes[i].completed) {
run_process(&processes[i]);
}
}
}
calculate_waiting_time(processes);
calculate_turnaround_time(processes);
print_result(processes);
return 0;
}
```
在这个程序中,我们使用了多个函数来实现不同的功能,使得程序更加模块化和易于维护。具体来说,我们使用了以下函数:
- `init_processes`: 初始化进程信息;
- `run_process`: 运行一个进程;
- `is_all_completed`: 判断所有进程是否都已经完成;
- `calculate_waiting_time`: 计算每个进程的等待时间;
- `calculate_turnaround_time`: 计算每个进程的周转时间;
- `print_result`: 输出每个进程的等待时间和周转时间。
这些函数的代码比较简单,可以让程序更加易于理解。需要注意的是,这个程序中使用了指针来传递进程的信息,以避免在函数调用中对进程信息进行复制。