Deep anatomy of C language [Chapter 1]

1.3.1

static int j;void fun1（void）{static int i = 0;i ++;}void fun2（void）{j = 0;j++;}intmain(){for(k=0; k<10; k++){fun1();fun2();}return 0;}

Q: Evaluate the values of I and j

 

1.4

Int main () {char a [1000]; int I; for (I = 0; I <1000; I ++) {A [I] =-1-I ;} printf ("% d", strlen (a); // Q: Return 0 ;}

1) according to the above explanation, how are-0 and + 0 stored in the memory respectively?
2), int I =-20;
Unsigned J = 10;
What is the value of I + J? Why?
3) What is the problem with the following code?

unsigned i ;for (i=9;i>=0;i--){printf("%u\n",i);}

1.5.2
What does sizeof (INT) * P mean?
Leave a few questions (the pointer and array will be explained in detail), under the 32-bit system:
Int * P = NULL;
What is the value of sizeof (p?
What about sizeof (* P?
Int A [100];
What is the value of sizeof (?
What about sizeof (A [100? // Pay special attention to this example.
What about sizeof (&?
What about sizeof (& A [0?
Int B [100];
Void fun (int B [1, 100])
{
Sizeof (B); // What is the value of sizeof (B?
}

 

1.8.1
Leave a question: Can I use the continue keyword in the switch case statement? Why?

1.11.1
Note: Read-Only variables modified by const must be initialized at the same time as defined. Why?
Leave a question: can the case statement be followed by a read-only variable modified by const?

1.12
Leave a question: const volatile int I = 10; is there any problem with this line of code? If no, what is the I attribute?

1.14.1
Struct student
{
} Stu;
What is the value of sizeof (Stu?

 

 

1.15.1

Union
{
Int I;
Char A [2];
} * P, U;
P = & U;
P-> A [0] = 0x39;
P-> A [1] = 0x38;
What is the P. I value?

1.15.2

// In x86 systems, what is the output value? # Include <stdio. h> intmain () {int A [5] = {1, 2, 3, 4, 5}; int * ptr1 = (int *) (& A + 1 ); int * ptr2 = (int *) (INT) A + 1); printf ("% x, % x", ptr1 [-1], * ptr2 ); return 0 ;}

 

1.16.2
Leave two questions:
A), enumerative can do things, # can define macros do? If so, why do I still need enumeration?
B) What is the value of sizeof (colorval? Why?

1.17.4
Leave two questions:
1), # define a int [10]
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
2), typedef int A [10];
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
3), # define a int * [10]
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
4), typedef int * A [10];
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
5), # define * A int [10]
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
6), typedef int (* A) [10];
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
7), # define * a * int [10]
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
8), typedef int * (* A) [10];
A), a [10] a [10];
B), a [10];
C), int A [10];
D), int;
E), a B [10];
F), a B;
G), a * B [10];
H), A * B;
Determine which definitions are correct and which ones are incorrect. In addition, how do I use int [10] And a [10?