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C studing NO.4 操作符1
source link: https://blog.51cto.com/u_15756673/5623656
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C studing NO.4 操作符1
精选 原创1、算术操作符
＋ - * / % 加减乘除取余
int main()
{
//int a = 9 / 2; //a=4 取整
//printf("%d\n", a);
//float a = 9 / 2; //a=4.000000
//printf("%f\n", a);
//float a = 9 / 2.0; //a=4.500000
//printf("%f\n", a);
//int a = 9 % 2; //a=1 取余
//printf("%d\n", a);
return 0;
}
{
//int a = 9 / 2; //a=4 取整
//printf("%d\n", a);
//float a = 9 / 2; //a=4.000000
//printf("%f\n", a);
//float a = 9 / 2.0; //a=4.500000
//printf("%f\n", a);
//int a = 9 % 2; //a=1 取余
//printf("%d\n", a);
return 0;
}
2、移位操作符
<< >>
int main()
{
int a = 1;
int b = a<< 2;
printf("%d\n", b);
return 0;
}
{
int a = 1;
int b = a<< 2;
printf("%d\n", b);
return 0;
}
3、位操作符
& (与) ^ （异或） |（或）
4、赋值操作符
= += -+ *= &= ^= |= <<= >>=
5、单目操作符
！ 逻辑反操作
— 负值
+正值
&取地址
sizeof操作数的类型长度（以字节为单位）
~对一个数的二进制位取反
--前置、后置--
++前置、后置++
*间接访问操作符（解引用操作符）
（类型）强制类型转换
int main()
{
//0表示假，非0就表示真
int a = 0;
printf("%d\n", !a);//!a=1
if (a)
{
printf("%s\n", "abc");
//如果a为真 做事
}
if (!a)
{
printf("%s\n", "def");
//如果a为假 做事
}
return 0;
}
{
//0表示假，非0就表示真
int a = 0;
printf("%d\n", !a);//!a=1
if (a)
{
printf("%s\n", "abc");
//如果a为真 做事
}
if (!a)
{
printf("%s\n", "def");
//如果a为假 做事
}
return 0;
}
int main()
{
//sizeof是一个操作符
//不是函数
//计算类型或者变量大小
int a = 10;
printf("%d\n", sizeof(int));
printf("%d\n", sizeof(a));
return 0;
}
{
//sizeof是一个操作符
//不是函数
//计算类型或者变量大小
int a = 10;
printf("%d\n", sizeof(int));
printf("%d\n", sizeof(a));
return 0;
}
int main()
{
int arr[10] = {0};
printf("%d\n", sizeof(arr));//计算数组的总大小10数组×4个字节
printf("%d\n", sizeof(arr[0]));//计算数组中单个大小
int sz = sizeof(arr) / sizeof(arr[0]);
printf("%d\n", sz);
return 0;
}
{
int arr[10] = {0};
printf("%d\n", sizeof(arr));//计算数组的总大小10数组×4个字节
printf("%d\n", sizeof(arr[0]));//计算数组中单个大小
int sz = sizeof(arr) / sizeof(arr[0]);
printf("%d\n", sz);
return 0;
}
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