哎想不到啊求神解答c语言

typedef enum _aimajor
{
major1 = 2,
major2 = 3,
major3 = 4
}aimajor;
aimajor ai;

char name[20] = "张三";
char sex[3] = "男";
int age = 19;
float height = 182.5;
float temperature = 36.2;

char name[20];
strcpy(name,"张三");
char sex[3] ;
strcpy(sex,"男");
int age;
age = 20;
float height;
height = 181.5;
float temperature;
temperature = 36.8;