int a[3] = {0, 1, 2};
float f[2] = {1.2, 2.3, 3.14};
char str[] = {'h', 'e', 'l', 'l', 'o'};
chat str1 = "iPhone";//这也是定义字符数组的方法，字符数组后面会详细讲解，这里先了解一下

int length = 4;
int a[length]; //这样可以
int a[length] = {2, 4, 6, 8};//这样的话就会报错

int a[] = {1, 3, 5, 7, 9};//数组的长度为5 相当于int a[5] = {1, 3, 5, 7, 9};

int ages[28];
//循环赋值
for(int i = 0; i < 28; i++)
{
  int age = arc4random() % 13 + 18;//每个人的年龄的范围是：18 ~ 30 之间的随机值
  ages[i] = age;//给每个元素赋值
}
//访问，也叫遍历
for(int i = 0; i < 28; i++)
{
  printf("a[%d] = %d ", i, ages[i]);
}

int a1[] = {2, 4, 5, 6, 10};
int a2[] = {1, 3, 4, 5, 6};
int a3[5];
for(int i = 0; i < 5; i++)
{
  a3[i] = a1[i] + a2[i];
  printf("a3[%d] = %d ", i, a3[i]);
}

a3[0] = 3 a3[1] = 7 a3[2] = 9 a3[3] = 11 a3[4] = 16

int arr[] = {2, 3, 4, 6, 7};
int length = sizeof(arr) / sizeof(arr[0]);
printf("length = %d\n", length);

length = 5

char str[4] = {'a', 'b', 'c', 'd'};
char str2[] = "iPhone";//另外一种方式

printf("str2 = %s\n", str2);//%s 输出字符串，遇到 '\0' 结束

char str[] = "iPhone";
unsigned long length = strlen(str);//strlen 表示有效长度
printf("length = %lu\n", length);

length = 6

char str1[] = "Unity";
char str2[] = "Android.....";
printf("%s\n", strcpy(str1, str2));

Android

char str1[] = "Unity";
char str2[] = " iPhone";
printf("%s\n", strcat(str1, str2));

Unity iPhone

char str1[] = "Unity";
char str2[] = "iPhone";
printf("%d\n", strcmp(str1, str2));

#include <stdio.h>
int main(int argc, char *argv[])
{
 int score[10]={76,85,90,67,59,79,82,95,91,65};
 int wait, length, i;
 length = sizeof(score) / sizeof(score[0]);
 for(i = 0; i < length; i++)
 {
 printf("%d \n", *(score + i));
 }
 scanf("%d", &wait);
}

76
85
90
67
59
79
82
95
91
65

int strlen(char *s)
{
 int n;
  
  for(n = 0; *s != '\0'; s++)
   n++;
  return n;
}