当前位置: 首页 > 文档资料 > 学习 C 语言 >

Show 例子 6

优质
小牛编辑
143浏览
2023-12-01

除了上面讨论的运算符之外,很少有其他重要的运算符,包括sizeof? : ? : C语言支持。

操作者描述
sizeof()返回变量的大小。sizeof(a),其中a是整数,将返回4。
&返回变量的地址。&一个; 返回变量的实际地址。
*Pointer to a variable.*a;
? :条件表达式。如果条件为真? 然后值X:否则值Y.

例子 (Example)

尝试以下示例来了解C中可用的所有其他运算符 -

#include <stdio.h>
main() {
   int a = 4;
   short b;
   double c;
   int* ptr;
   /* example of sizeof operator */
   printf("Line 1 - Size of variable a = %d\n", sizeof(a) );
   printf("Line 2 - Size of variable b = %d\n", sizeof(b) );
   printf("Line 3 - Size of variable c= %d\n", sizeof(c) );
   /* example of & and * operators */
   ptr = &a;	/* 'ptr' now contains the address of 'a'*/
   printf("value of a is  %d\n", a);
   printf("*ptr is %d.\n", *ptr);
   /* example of ternary operator */
   a = 10;
   b = (a == 1) ? 20: 30;
   printf( "Value of b is %d\n", b );
   b = (a == 10) ? 20: 30;
   printf( "Value of b is %d\n", b );
}

编译并执行上述程序时,会产生以下结果 -

Line 1 - Size of variable a = 4
Line 2 - Size of variable b = 2
Line 3 - Size of variable c= 8
value of a is  4
*ptr is 4.
Value of b is 30
Value of b is 20