采用c语言编程实现连续分配与链接分配的代码
时间: 2023-12-12 17:02:02 浏览: 62
以下是C语言实现的连续分配与链接分配的代码:
连续分配:
```c
#include <stdio.h>
#include <stdlib.h>
#define MAX_SIZE 100
int main() {
int memory[MAX_SIZE] = {0}; // 内存块
int size, start, i;
printf("请输入内存块大小和起始地址:\n");
scanf("%d %d", &size, &start);
// 检查内存块是否可用
for (i = start; i < start + size; i++) {
if (memory[i] == 1) {
printf("内存块不可用\n");
exit(1);
}
}
// 分配内存块
for (i = start; i < start + size; i++) {
memory[i] = 1;
}
printf("内存分配成功\n");
return 0;
}
```
链接分配:
```c
#include <stdio.h>
#include <stdlib.h>
typedef struct _block {
int start; // 起始地址
int size; // 大小
int next; // 下一个块的位置
} Block;
#define MAX_SIZE 100
int main() {
int memory[MAX_SIZE] = {0}; // 内存块
Block block[MAX_SIZE]; // 内存块链表
int free_head = 0; // 空闲块链表头
int used_head = -1; // 已用块链表头
int size, i;
// 初始化空闲块链表
for (i = 0; i < MAX_SIZE - 1; i++) {
block[i].start = i;
block[i].size = 1;
block[i].next = i + 1;
}
block[MAX_SIZE-1].start = MAX_SIZE-1;
block[MAX_SIZE-1].size = 1;
block[MAX_SIZE-1].next = -1;
free_head = 0;
printf("请输入内存块大小:\n");
scanf("%d", &size);
// 查找空闲块
int prev = -1;
int curr = free_head;
while (curr != -1) {
if (block[curr].size >= size) {
// 分配内存块
int start = block[curr].start;
int end = start + size;
for (i = start; i < end; i++) {
memory[i] = 1;
}
// 更新已用块链表
if (prev == -1) {
free_head = block[curr].next;
used_head = curr;
} else {
block[prev].next = block[curr].next;
block[curr].next = used_head;
used_head = curr;
}
// 更新空闲块链表
if (block[curr].size == size) {
if (prev == -1) {
free_head = block[curr].next;
} else {
block[prev].next = block[curr].next;
}
} else {
block[curr].start += size;
block[curr].size -= size;
}
printf("内存分配成功\n");
return 0;
}
prev = curr;
curr = block[curr].next;
}
printf("内存不足\n");
return 1;
}
```
以上代码仅供参考,实际应用中还需要考虑更多因素,如内存碎片等。
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