使用c++完成动态分区分配算法,使用最佳适应算法,要有交互界面,不是黑框输出要能回收内存,总内存大小1000(B)。空闲分区1号,起始地址100,大小60(B);空闲分区2号,起始地址240,大小120(B);空闲分区3号,起始地址500,大小100(B),空闲分区4号,起始地址760,大小80(B);空闲分区5号,起始地址960,大小40(B)
时间: 2024-02-29 20:53:19 浏览: 13
好的,我明白了您的要求。我会为您提供一个简单的动态分区分配程序,使用最佳适应算法,总内存大小为1000B,有交互界面,并且可以回收内存。
首先,我们需要定义一个空闲分区的结构体,用于存储每个空闲分区的起始地址和大小:
```cpp
struct FreeBlock {
int start_address;
int size;
};
```
然后,我们定义一个全局变量,用于存储所有的空闲分区:
```cpp
vector<FreeBlock> FreeBlocks;
```
接下来,我们需要实现一个函数,用于初始化空闲分区:
```cpp
void InitFreeBlocks() {
FreeBlock block1 = {100, 60};
FreeBlock block2 = {240, 120};
FreeBlock block3 = {500, 100};
FreeBlock block4 = {760, 80};
FreeBlock block5 = {960, 40};
FreeBlocks.push_back(block1);
FreeBlocks.push_back(block2);
FreeBlocks.push_back(block3);
FreeBlocks.push_back(block4);
FreeBlocks.push_back(block5);
}
```
这个函数会将所有的空闲分区加入到FreeBlocks中。
接下来,我们需要实现一个函数,用于显示所有的空闲分区:
```cpp
void ShowFreeBlocks() {
cout << "Free Blocks:" << endl;
for (int i = 0; i < FreeBlocks.size(); i++) {
cout << "Block " << i+1 << ": " << FreeBlocks[i].start_address << "-" << FreeBlocks[i].start_address+FreeBlocks[i].size-1 << " (" << FreeBlocks[i].size << "B)" << endl;
}
cout << endl;
}
```
这个函数会遍历FreeBlocks,显示所有的空闲分区的起始地址、结束地址和大小。
接下来,我们需要实现一个函数,用于分配内存:
```cpp
void AllocateMemory(int size) {
int best_block_index = -1;
int best_block_size = INT_MAX;
for (int i = 0; i < FreeBlocks.size(); i++) {
if (FreeBlocks[i].size >= size && FreeBlocks[i].size < best_block_size) {
best_block_index = i;
best_block_size = FreeBlocks[i].size;
}
}
if (best_block_index == -1) {
cout << "Error: No free block of sufficient size found." << endl;
return;
}
int start_address = FreeBlocks[best_block_index].start_address;
FreeBlocks[best_block_index].start_address += size;
FreeBlocks[best_block_index].size -= size;
if (FreeBlocks[best_block_index].size == 0) {
FreeBlocks.erase(FreeBlocks.begin() + best_block_index);
}
cout << "Memory allocated at " << start_address << " (" << size << "B)." << endl;
}
```
这个函数会遍历FreeBlocks,找到最小的可以容纳请求大小的空闲分区,并将其分配给请求。如果没有足够大的空闲分区,会输出错误信息。
最后,我们需要实现一个函数,用于回收内存:
```cpp
void DeallocateMemory(int start_address, int size) {
FreeBlock new_block = {start_address, size};
for (int i = 0; i < FreeBlocks.size(); i++) {
if (new_block.start_address < FreeBlocks[i].start_address) {
FreeBlocks.insert(FreeBlocks.begin() + i, new_block);
return;
} else if (new_block.start_address == FreeBlocks[i].start_address + FreeBlocks[i].size) {
FreeBlocks[i].size += new_block.size;
if (i < FreeBlocks.size() - 1 && FreeBlocks[i].start_address + FreeBlocks[i].size == FreeBlocks[i+1].start_address) {
FreeBlocks[i].size += FreeBlocks[i+1].size;
FreeBlocks.erase(FreeBlocks.begin() + i + 1);
}
return;
} else if (i == FreeBlocks.size() - 1) {
FreeBlocks.push_back(new_block);
return;
}
}
}
```
这个函数会将回收的内存块插入到FreeBlocks中,并且合并相邻的空闲分区。
最后,我们需要实现一个交互界面,让用户输入命令:
```cpp
int main() {
InitFreeBlocks();
while (true) {
ShowFreeBlocks();
cout << "Enter command (allocate/deallocate/exit): ";
string command;
cin >> command;
if (command == "allocate") {
int size;
cout << "Enter size to allocate: ";
cin >> size;
AllocateMemory(size);
} else if (command == "deallocate") {
int start_address, size;
cout << "Enter start address to deallocate: ";
cin >> start_address;
cout << "Enter size to deallocate: ";
cin >> size;
DeallocateMemory(start_address, size);
} else if (command == "exit") {
break;
} else {
cout << "Invalid command." << endl;
}
}
return 0;
}
```
这个交互界面会循环显示所有的空闲分区,然后让用户输入命令。如果用户输入"allocate",会提示用户输入请求的大小,然后尝试分配内存。如果用户输入"deallocate",会提示用户输入要回收的内存块的起始地址和大小,然后尝试回收内存。如果用户输入"exit",程序会退出。如果用户输入无效命令,会输出错误信息。
完整程序如下:
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