网易云课堂_C语言程序设计进阶_第一周：数据类型：整数类型、浮点类型、枚举类型

 1 #define _CRT_SECURE_NO_WARNINGS
 2 
 3 #include<stdio.h>
 4 
 5 main()
 6 {
 7     int a = 6;
 8 
 9     printf("sizeof(int)=%d\n", sizeof(int));
10 
11     printf("sizeof(a)=%d\n", sizeof(a++));//sizeof是静态运算符，它的结果在编译时刻就决定了
12     //不要在sizeof的括号里做运算，这些运算不会做的
13     
14     printf("a=%d\n", a);//仍然是6
15 
16     printf("sizeof(a)=%d\n", sizeof(a + 1.0));//8，变成double
17 
18     printf("a=%d\n", a);//仍然是6
19 
20     system("pause");
21 }

 1 #define _CRT_SECURE_NO_WARNINGS
 2 
 3 #include<stdio.h>
 4 
 5 main()
 6 {
 7     printf("sizeof(char)=%d\n", sizeof(char));
 8 
 9     printf("sizeof(short)=%d\n", sizeof(short));
10 
11     printf("sizeof(int)=%d\n", sizeof(int));
12 
13     printf("sizeof(long)=%d\n", sizeof(long));
14 
15     printf("sizeof(long long)=%d\n", sizeof(long long));
16 
17     system("pause");
18 }

 1 #define _CRT_SECURE_NO_WARNINGS
 2 
 3 #include<stdio.h>
 4 #include<limits.h>
 5 
 6 main()
 7 {
 8     char c = 255;
 9     int i = 255;
10 
11     printf("c=%d,i=%d\n", c, i);//char超出范围，所以显示-1
12 
13     printf("%d,%d\n", CHAR_MAX, CHAR_MIN);//127 -128
14 
15     system("pause");
16 }