C语言与C++、Java的区别_C

功能	C语言	C++	Java
比较两数的大小	fmax(a, b)	max(a, b)	Math.max(a, b)
链表定义	struct ListNode* dummy = malloc(sizeof(struct ListNode)); // 申请空间 dummy->next = head; dummy->val = 0;	ListNode* dummy = new ListNode(0, head);	ListNode dummy = new ListNode(0, head);
释放内存	free(node);	delete(node);
数组申请使用	int* arr = (int*)calloc(10, sizeof(int)); arr[i] = 1;	int arr[10]; arr[i] = 1;	int[] arr = new int[10]; arr[i] = 1;
绝对值	abs()	abs()	Math.abs()
int最值	INT_MIN INT_MAX	INT_MIN INT_MAX	Integer.MIN_VALUE Integer.MAX_VALUE
long最值	LONG_MIN LONG_MAX	LONG_MIN LONG_MAX	Long.MIN_VALUE Long.MAX_VALUE
kong	NULL	nullptr	null
声明二叉树	struct TreeNode* node = malloc(sizeof(struct TreeNode)); node->left = NULL; node->right = NULL; node->val = 0;	TreeNode* node = new TreeNode(); node->left = nullptr; node->right = nullptr; node->val = 0;	TreeNode node = new TreeNode(); node.left = null; node.right = null; node.val = 0;
声明结构体	struct Height { int max_height; bool isBST; };	struct Height { int a; bool b; Height(int max, bool isB) : a(max), b(isB) {} };	class Height { int a; boolean b; public Height(int max, boolean isB) { a = max; b = isB; } }
数组初值	数组的初值是随机的	数组的初值默认0	数组的初值默认0
二维数组	int dp[N][2];	vector> dp(N, vector(2));	int[][] dp = new int[N][2];

欢迎分享，转载请注明来源：内存溢出

C语言与C++、Java的区别