1. 数据类型

 //数据类型
    printf("%zu \t 打印字符%c \n",sizeof(char),'x'  );//字符数据类型  占用1个字节
    printf("%zu\t 打印短整型%d \n" ,sizeof(short),1); //短整型  2
    printf("%zu\t 打印整形%d \n",sizeof(int),123); //整形  4
    printf("%zu\t 打印长整型%d \n",sizeof(long),132323232); //长整型  8
    printf("%zu\t 打印更长的整形%d \n",sizeof(long long),123344444); //更长的整形 8
    printf("%zu\t 打印浮点型%.2f \n",sizeof(float),3.1); //单精度浮点数  4
    printf("%zu\t 打印浮点型%lf \n",sizeof(double),3.1415);  //双精度浮点数  8
    printf("打印字符串%s \n","xxdss");

2. 常量

  //1.const
    const float pai = 3.13;
    // pai = 3.14;  //const修饰不可修改
    
   //2.define
   #define  Max 150
    printf("最大值 %d\n",Max);
    

3.字符串

//字符串的结束符为\0,"hello world"中末尾自动加的\0
    char arr1[] = "hello";
    char arr2[] = {'h','e','l','l','o'};
    char arr3[] = {'h','e','l','l','o','\0'};
    printf("%s\n",arr2);
    printf("%s\n",arr1);
    printf("%s\n",arr3);

4.转义字符

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