Q->Data=(int*)malloc(sizeof(int)*(MaxSize+1));

A: This line of code dynamically allocates memory for an integer array of size MaxSize + 1. The malloc function is used to allocate memory on the heap, and the sizeof operator is used to determine the size of each integer element in the array. The resulting pointer to the allocated memory is then assigned to the variable Data.

相关问题

Q->Data=(int*)malloc(sizeof(int)*(MaxSize+1));这里的sizeof（int*）（MaxSize+1）怎么理解

这条代码的含义是在堆内存中分配一个大小为 sizeof(int)*(MaxSize 1) 字节的空间，并将其首地址赋值给指针变量 Data。

其中，sizeof(int) 表示 int 类型所占用的字节数，MaxSize 1 表示要分配的 int 类型元素的个数（MaxSize 个元素加上一个额外的位置，用于防止数组越界）。因此，sizeof(int)*(MaxSize 1) 就是要分配的空间的总大小。

#include<stdio.h> #include<stdlib.h> Typedef struct Graph{ Char* vexs; Int** arcs; Int vexnum,arcnum; )Graph; Graph* initGraph(int vexnum){ Graph* G=(Graph*)malloc(sizeof(Graph)) G->vexs=(char*)malloc(sizeof (char)*vexnum) G->arcs=(int**)malloc(sizeof (int*)*vexnum) For(int i=0;i<vexnum;I++) { G->arcs[i]= (int*)malloc(sizeof (int)*vexnum)} G->vexnum=Vexnum; G->arcnum=0; Return G } Int createGraph(Graph* G,char* vexs,int* arcs) {for(i=0;i<G->vexnum;i++) G->vexs[i]=vexs[i]; For((j=0;j<G->vexnum;j++) G->arcs[i][j]=*(arcs+i*vexnum+j ) If(G->arcs[i][j]!=0) G->arcnum++; } G->arcnum/=2; } Void DFS(Graph* G,int *visit,int index){ Printf("%c",G->vexs[index]) Visit[index]=1; For(int i=0;i<G->vexnum;i++) If(G->arcs[index][i]==1&&visit[index]!=1) DFS(G,visit,i) } Void BFS(Graph* G,int *visit ,int index){ Printf("%c",&G->vexs[index]) Visit[index]=1; Queue* initQueue(); enQueue(Q,index); while(!isEmpty(Q)) int i=deQueue(); For(int j=0;j<G->vexnum;J++) If(G->arcs[i][j]==1&&!visit[j]) Printf("%c",G->vexs[j]) Visit[j]=1; enQueue(Q,j);} } #define MAXSIZE 5 Typedef struct Queue{ Int front Int rear Int data[MAXSIZE] }Queue; Queue* Q InitQueue() { Queue* Q=(Queue*)malloc(sizeof(QUeue)); Queue->front=Queue->rear=0; Return Q; } Int enQueue(Queue* Q, int data) If (isFull(Q)){ Return 0} Else Q->data[Q->rear]=data; Q->rear=(Q->rear+1)%MAXSIZE } Int deQueue(Queue* Q) If (isempty(Q)){ Return 0} Else Int data=Q->data[Q->front]; Q->front=(Q->front+1)%MAXSIZE Return data; } Void printfQueue(Queue* Q){ Int length=(Q->rea-Q->front+MAXSIZE)%MAXSIZE For(int i=0;i<length;i++) Printf("%d->",Q->data[Q->front]) Q->front=(Q->front+1)%MAXSIZE; Int main(){ Graph* G=initGraph(5); Int arcs[5][5]={ 0,1,1,1,0, 0,1,1,1,0, 0,1,1,1,0, 0,1,1,1,0, 0,1,1,1,0, }; CreateGraph(*G,"ABCDE",(int*)arcs); Int* visit=(int*)malloc(sizeof(int)*G->vexnum); For(int i=0;i<G->vexnum;i++) Visit[i]=0; DFS(G,visit,0); BFS(G,visit,0) }修改正确并转化为c语言代码

抱歉，您提供的代码已经是C语言代码。不过，代码中存在一些拼写错误和语法错误，我给您修正一下：

#include <stdio.h>
#include <stdlib.h>

#define MAXSIZE 5

typedef struct Graph{
    char* vexs;
    int** arcs;
    int vexnum, arcnum;
}Graph;

Graph* initGraph(int vexnum) {
    Graph* G = (Graph*)malloc(sizeof(Graph));
    G->vexs = (char*)malloc(sizeof(char) * vexnum);
    G->arcs = (int**)malloc(sizeof(int*) * vexnum);
    for(int i = 0; i < vexnum; i++) {
        G->arcs[i] = (int*)malloc(sizeof(int) * vexnum);
    }
    G->vexnum = vexnum;
    G->arcnum = 0;
    return G;
}

int createGraph(Graph* G, char* vexs, int* arcs) {
    for(int i = 0; i < G->vexnum; i++) {
        G->vexs[i] = vexs[i];
        for(int j = 0; j < G->vexnum; j++) {
            G->arcs[i][j] = *(arcs + i * G->vexnum + j);
            if(G->arcs[i][j] != 0) {
                G->arcnum++;
            }
        }
    }
    G->arcnum /= 2;
}

typedef struct Queue{
    int front;
    int rear;
    int data[MAXSIZE];
}Queue;

Queue* initQueue() {
    Queue* Q = (Queue*)malloc(sizeof(Queue));
    Q->front = Q->rear = 0;
    return Q;
}

int isFull(Queue* Q) {
    if((Q->rear + 1) % MAXSIZE == Q->front) {
        return 1;
    } else {
        return 0;
    }
}

int isEmpty(Queue* Q) {
    if(Q->front == Q->rear) {
        return 1;
    } else {
        return 0;
    }
}

int enQueue(Queue* Q, int data) {
    if(isFull(Q)) {
        return 0;
    } else {
        Q->data[Q->rear] = data;
        Q->rear = (Q->rear + 1) % MAXSIZE;
        return 1;
    }
}

int deQueue(Queue* Q) {
    if(isEmpty(Q)) {
        return 0;
    } else {
        int data = Q->data[Q->front];
        Q->front = (Q->front + 1) % MAXSIZE;
        return data;
    }
}

void printfQueue(Queue* Q) {
    int length = (Q->rear - Q->front + MAXSIZE) % MAXSIZE;
    for(int i = 0; i < length; i++) {
        printf("%d->", Q->data[Q->front]);
        Q->front = (Q->front + 1) % MAXSIZE;
    }
}

void DFS(Graph* G, int* visit, int index){
    printf("%c", G->vexs[index]);
    visit[index] = 1;
    for(int i = 0; i < G->vexnum; i++) {
        if(G->arcs[index][i] == 1 && visit[i] != 1) {
            DFS(G, visit, i);
        }
    }
}

void BFS(Graph* G, int* visit ,int index) {
    printf("%c", G->vexs[index]);
    visit[index] = 1;
    Queue* Q = initQueue();
    enQueue(Q, index);
    while(!isEmpty(Q)) {
        int i = deQueue(Q);
        for(int j = 0; j < G->vexnum; j++) {
            if(G->arcs[i][j] == 1 && !visit[j]) {
                printf("%c", G->vexs[j]);
                visit[j] = 1;
                enQueue(Q, j);
            }
        }
    }
}

int main() {
    Graph* G = initGraph(5);
    int arcs[5][5] = {
        {0, 1, 1, 1, 0},
        {0, 1, 1, 1, 0},
        {0, 1, 1, 1, 0},
        {0, 1, 1, 1, 0},
        {0, 1, 1, 1, 0}
    };
    createGraph(G, "ABCDE", (int*)arcs);
    int* visit = (int*)malloc(sizeof(int) * G->vexnum);
    for(int i = 0; i < G->vexnum; i++) {
        visit[i] = 0;
    }
    DFS(G, visit, 0);
    printf("\n");
    for(int i = 0; i < G->vexnum; i++) {
        visit[i] = 0;
    }
    BFS(G, visit, 0);
    printf("\n");
    return 0;
}