#include <stdio.h>
#include <windows.h>
int main()
{
printf("(are you ok \x030 ??)\n"); //三字母词
system("pause");
return 0;
}
int main()
{
printf("%d\n", sizeof(char));
printf("%d\n", sizeof(short));
printf("%d\n", sizeof(int));
printf("%d\n", sizeof(long));
printf("%d\n", sizeof(long long));
printf("%d\n", sizeof(float));
printf("%d\n", sizeof(double));
printf("%d\n", sizeof(long double));
system("pause");
return 0;
}
int main()
{
int num = 0;
const int c_num = 0;
num = 10;
c_num = 20; //当const 修饰一个标识符的时候,它具有常属性，不能被直接改变
system("pause");
return 0;
}
int main()
{
const int sz = 10;
int arr[10] = { 0 };
int arr2[sz] = { 0 };//当const 修饰一个标识符的时候，这个标识符依然是一个变量
system("pause");
return 0;
}
#define PAI 3.14 //没有；
int main()
{
int radius = 1;
double area = PAI*radius*radius;
printf("%f\n", area); //注意是%f
system("pause");
return 0;
}
enum Sex
{
MALE,
FEMALE,
SECRET
};
int main()
{
printf("%d\n", MALE);
printf("%d\n", FEMALE);
printf("%d\n", SECRET); //枚举常量从0开始
system("pause");
return 0;
}
void test()
{
static int num = 0; //num变为全局变量
num++;
printf("%d\n", num);
}
int main()
{
int i;
for (i = 0; i < 10; i++)
{
test();
}
system("pause");
return 0;
}
int main()
{
int i = 43;
printf("%d\n", printf("%d", printf("%d", i))); //printf的返回类型是int,且处理方式为从右至左
printf("%d\n", i);
system("pause");
return 0;
}
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