好久之前的了，學習c語言的筆記。 依舊是老套路，從基礎的變數型別，到函式定義一步步學起

#include <stdio.h>
#include <string.h>

//控制語句 這個在不同語言裡幾乎都不變
void test5()
{
	int a = 4;

	//if判斷語句
	if (0 < a < 2)
		printf("var is level 1\n");
	else if (a >= 2 && a <= 5)
	{
		printf("var is level 2\n");
	}
	else
	{
		printf("var is level 3\n"
 
);
	}


	//switch 分支語句
	switch (a)
	{
	case 1:printf("var vlue is 1\n"); break;
	case 2:printf("var vlue is 2\n"); break;
	case 3:printf("var vlue is 3\n"); break;
	case 4:printf("var vlue is 4\n"); break;
	default:printf("var vlue is out of control\n"); break;
	}


	//for迴圈語句
	for (int i = 0; i <= a &&
 
 i != 3; i++)
	{
		printf("for vlue is :%d\n", i);
	}

	
	//while 迴圈
	int j = 0;
	while (j <= a)
	{
		printf("while vlue is :%d\n", j);
		j++;
	}


	//do迴圈 跟while相比 至少迴圈一下 因為迴圈體先執行後判斷
	j = 0;
	do 
	{
		printf("do - while vlue is :%d\n", j);
		j++;
	} 
	while (j <= 4);


	//goto語句的標籤 後期可以跳轉到這裡執行
aaa:
	j--
 
;
	printf("goto j vlue is :%d\n", j);
	if (j > 1)
		goto aaa;


	gets();

}