C语言编程，程序设计新手入门基础套路

基本数据类型

字符型

char c = 'a';

整数型

int a = 7, b = 8, c;

c = a + b;

c = a - b;

数组

int array[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8 ,9};

char name[10] = "Underwood";

array[0] = 10;

name[0] = 'u';

结构体

struct A {

 int number;

 char name[10];

};

struct A s;

s.number = 10;

s.name[0] = 'a';

指针

int a = 0;

int *pa = &a;

*pa = 5;

char name[10];

char *pc = name;

*pc = 'a';

pc += 1;

*pc = 'b';

struct A {

 int number;

 char name[10];

};

struct A s;

struct A *ps = &s;

ps->number = 10;

ps->name[0] = 'a';

流程控制

分支语句

int age = 18;

if (age >=18)

 printf("An adult\n");

else if (age >= 3)

 printf("A child\n");

else

 printf("A baby");

循环语句

for循环：

int i, sum = 0;

for (i = 0; i < 10; i++)

 sum += I;

while循环：

int i = 0, sum = 0;

while (i < 10) {

 sum += i;

 i++;

}

函数

void check_age(int age) {  if (age >=18)    printf("An adult\n");  else if (age >= 3)    printf("A child\n");  else    printf("A baby");}

check_age(18);