好久之前的了,学习c语言的笔记。
依旧是老套路,从基础的变量类型,到函数定义一步步学起
#include <stdio.h>
#include <string.h>
//控制语句 这个在不同语言里几乎都不变
void test5()
{
int a = 4;
//if判断语句
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 分支语句
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循环语句
for (int i = 0; i <= a && i != 3; i++)
{
printf("for vlue is :%d\n", i);
}
//while 循环
int j = 0;
while (j <= a)
{
printf("while vlue is :%d\n", j);
j++;
}
//do循环 跟while相比 至少循环一下 因为循环体先执行后判断
j = 0;
do
{
printf("do - while vlue is :%d\n", j);
j++;
}
while (j <= 4);
//goto语句的标签 后期可以跳转到这里执行
aaa:
j--;
printf("goto j vlue is :%d\n", j);
if (j > 1)
goto aaa;
gets();
}