printf

1. Get the address of the array no, because the array name itself is an address #include　 int　main(void) { 　　char　c　=　'A'; 　　char　cs[]　=　"ABC"; 　　printf("%c,%s\n",c,cs);　　　　　　/*　获取字符及字符数组的内容　*/ 　　

1. Variable addresses can be obtained through & variables: #include　 int　main(void) { 　　int　num　=　10; 　　printf("变量值:　%d\n",num); 　　printf("变量址:　%d\n",&num); 　　getchar(); 　　return　0; } 2. A variable that represents a variable address is a

1. The logo of the array is []: #include　 int　main(void) { 　　int　nums[3]; 　　nums[0]　=　11; 　　nums[1]　=　22; 　　nums[2]　=　33; 　　printf("%d,%d,%d",nums[0],nums[1],nums[2]); 　　getchar(); 　　return　0; } 2. Size and dimensions of the array: #include　

1. Printf enumeration to display the ordinal of an enumeration: #include　 int　main(void) { 　　enum　ABC{AAA,BBB,CCC}; 　　enum　ABC　e1,e2,e3; 　　e1　=　AAA; 　　e2　=　BBB; 　　e3　=　CCC; 　　printf("%d,　%d,　%d\n",　e1,　e2,　e3); 　　getchar(); 　　return　0; } 2.

1. The result of the operation exceeds the type size: #include　 #include　 int　main(void) { 　　short　s1　=　SHRT_MAX; 　　short　s2　=　SHRT_MAX; 　　short　num1; 　　int　num2; 　　/*　不会是期望的值　*/ 　　num1　=　s1　+　s2; 　　printf("%d\n",num1); 　　/*　这样可以了　*/ 　　num2　=　s1　

曾经对float　num=3.14f;　这样的赋值非常疑惑,其实现在也不明白. 既然说明了是float类型,又何必在3.14后面挂个f呢? 书上说: int　num=100;　一个整数常量将默认为int类型(除非常数有后缀或超出了int的范围) double　num=3.14;　一个浮点数常量将默认为double类型 并要求: long　num=100L; long　long　num=100LL; unsigned　long=100UL; unsigned　long　long　num=100

The variable that gets the type size is best not the int type, but the size_t type; size_t are defined in stdio.h and stddef.h. 1. Get the size of a known type: #include #include int main (void){char n = 2;size_t size; size = sizeof

In the C language, the char type is always a byte, and the Double-byte character type is wchar_t; But it is not a built-in type, defined in Stddef.h. Assign a value to a character or character array (that is, a string) of type wchar_t to be

整型int可添加short和long: short　int:简为short; long　int:　简为long; long　long　int:　简为long　long 它们都可以再添加　unsigned: unsigned　int:　　　　　　简为unsigned unsigned　short　int:　　　简为unsigned　short unsigned　long　int:　　　简为unsigned　long unsigned　long　long　int:　简为unsigned　long　

C Language Data type: Basic type, constructed type, pointer type, empty type. Basic types include: integer, character, floating-point (single, double), enumeration. The constructed types also include: arrays, structs, and common bodies. 1.

Example 1: #include　 #include　 int　main(void) { 　　char　str[256]; 　　scanf("%s",　str); 　　if　(strlen(str)　 　　　　goto　Label1; 　　}　else　{ 　　　　goto　Label2; 　　} 　　Label1: 　　　　printf("\n输入内容没有超过10个字符"); 　　　　goto　Label3; 　　Label2:

1. General: #include　 int　main(void) { 　　int　i; 　　for　(i　=　0;　i　 　　　　switch　(i)　{ 　　　　　　case　1: 　　　　　　　　printf("%d\n",　i); 　　　　　　　　break; 　　　　　　case　3: 　　　　　　　　printf("%d\n",　i); 　　　　　　　　break; 　　　　　　case　5: 　　　　　　　　printf("%d\n",　i);

1. General: #include　 int　main(void) { 　　int　i; 　　for　(i=0;i 　　　　if　(i%2==0)　printf("%d　是偶数\n",　i); 　　　　 if　(i%2!=0)　printf("%d　是奇数\n",　i); 　　 } 　　getchar(); 　　return　0; } #include　 int　main(void) { 　　int　i; 　　for　(i　=　0;　i　 　　　　if　(i　>　4) 　　　　　

1. While loop: #include　 int　main(void) { 　　int　i=0; 　　while　(i 　　　　i++; 　　　　printf("%d\n",　i); 　　} 　　getchar(); 　　return　0; } 2. Do While loop: #include　 int　main(void) { 　　int　i=0; 　　do 　　{ 　　　　i++; 　　　　printf("%d\n",　i); 　　}　while　(i

1. For the basic form of the loop: #include　 int　main(void) { 　　int　i; 　　for　(i=0;i　 　　　　printf("%d\n",i); 　　} 　　getchar(); 　　return　0; } 2. Step Size: #include　 int　main(void) { 　　int　i; 　　for　(i=0;i　 　　　　printf("%d\n",i); 　　} 　　getchar();

\n //换行 \r //回车 \b //退格 \f //换页 \t //水平制表符 \v //垂直制表符 \a //响声 \" //双引号 \' //单引号 \x?? //用小写 x 和两位数字(十六进制数)表示一个字符 \??? //用三位数字(八进制)表示一个字符 Example 1: #include　 int　main(void) { 　　printf("\"C++Builder\"　2009\n"); 　　printf("\x41"); 　　putchar('\n');

3.if...elseif statement The actual application often faces more choice, at this time, will If...else expands, then obtains the IF...ELSEIF structure, its general form is: if statement 1 else if statement 2 else if

In the three basic structures of the program, the second is the choice of structure, its basic characteristics are: The process of the program is composed of multiple branches, in the process of executing a program, according to different

6.3.1 pointer operators and pointer expressions There are two operators on pointers in C: & Operator: Takes the address operator, &m is the address of the variable m. * Operator: pointer operator, *PTR represents the variable to which it is

Because the function call of C program is called by value, that is, when the actual parameter is combined with the formal parameter, the real arguments value is passed to the formal parameter, so when we use the function to process the array, if we