动态分区最佳适应算法c语言,使用最佳适应算法对内存实现模拟动态分区管理...

以下是使用最佳适应算法对内存实现模拟动态分区管理的 C 语言代码：

#include<stdio.h>

#define MAX_SIZE 100

int free_blocks[MAX_SIZE];

int main()
{
    int i, n, choice;
    int mem_size, block_size, block_num, frag_size;
    int best_fit(int);
    void allocate(int, int);
    void deallocate(int, int);
    void display();

    printf("Enter the total memory size: ");
    scanf("%d", &mem_size);

    printf("Enter the number of blocks: ");
    scanf("%d", &n);

    for(i=0; i<n; i++){
        printf("Enter the size of block %d: ", i+1);
        scanf("%d", &free_blocks[i]);
    }

    while(1){
        printf("\n1. Allocate Memory\n2. Deallocate Memory\n3. Display\n4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch(choice){
            case 1: // Allocate Memory
                printf("Enter the size of memory block to be allocated: ");
                scanf("%d", &block_size);
                block_num = best_fit(block_size);
                if(block_num == -1){
                    printf("Memory allocation failed! No suitable block found.\n");
                }
                else{
                    allocate(block_num, block_size);
                    printf("Memory allocated successfully.\n");
                }
                break;

            case 2: // Deallocate Memory
                printf("Enter the block number to be deallocated: ");
                scanf("%d", &block_num);
                if(block_num < 1 || block_num > n){
                    printf("Invalid block number!\n");
                }
                else{
                    deallocate(block_num-1, free_blocks[block_num-1]);
                    printf("Memory deallocated successfully.\n");
                }
                break;

            case 3: // Display
                display();
                break;

            case 4: // Exit
                return 0;

            default:
                printf("Invalid choice!\n");
        }
    }

    return 0;
}

int best_fit(int block_size){
    int i, best_block = -1, best_frag = MAX_SIZE;

    for(i=0; i<n; i++){
        if(free_blocks[i] >= block_size && free_blocks[i]-block_size < best_frag){
            best_block = i;
            best_frag = free_blocks[i]-block_size;
        }
    }

    return best_block;
}

void allocate(int block_num, int block_size){
    free_blocks[block_num] -= block_size;
}

void deallocate(int block_num, int block_size){
    free_blocks[block_num] += block_size;
}

void display(){
    int i;

    printf("\nMemory Status:\n");

    for(i=0; i<n; i++){
        printf("Block %d: %d KB\n", i+1, free_blocks[i]);
    }
}

在这个代码中，`free_blocks` 数组用于存储每个空闲块的大小，`n` 是空闲块的数量。`best_fit` 函数使用最佳适应算法来查找最适合分配请求的内存块，并返回该块的编号。`allocate` 函数用于将给定大小的内存块分配给指定的内存块编号。`deallocate` 函数用于释放给定内存块编号中的内存块。`display` 函数用于显示当前内存块的状态。

在程序开始时，用户输入总内存大小和空闲块的数量以及每个空闲块的大小。然后，用户可以使用菜单选择内存分配和释放操作，或者显示当前内存块的状态，或者退出程序。