C语言零基础精通变量与常量

#include<stdio.h>
int a = 100;
int main()
{       
     int a = 10;  
     printf("%d\n," a);  
     return 0;
}   

#include<stdio.h>
int main()
{          
     int a = 0;    
     int b = 0;    
     int sum = 0;    
     scanf("%d  %d", &a, &b);            
     sum = a + b;           
     printf("sum = %d\n", sum);          
     return 0;
}

#include<stdio.h>
int main()
{       
     printf（"hehe\n"）;        
     int a＝10;             
     printf（"a = %d", a）;//代码作用域      
     return 0;
}

#include<stdio.h>
int main()
{     
     printf("hehe\n");    
     printf("a=%d", a);       
     {               
          int a = 10;       
     }        
     return 0;
}

#include<stdio.h>
int main（）
{       
     printf（"hehe\n"）;   
     {           
          int a＝10;  //代码的作用域        
          printf（"a＝％d", a）;       
     }        
     return 0;
}

#include<stdio.h>
int main()
{      
     3.14;      //字面常量    
     10;        //字面常量    
     'a';       //是字面常量，也是字符常量    
     'abcdefg'; //字面常量，也是字符串常量    
     return 0;
}

#include<stdio.h>
int main()
{     
     const int num = 10;//变量       
     num = 20;       
     printf（"num = %d\n",num）;      //输出为20        
     int arr[10] = {0};//10个元素       
     const int n = 10;       
     int arr[n] = {0};  //错误    
     retuen 0;
}

#define MAX 10000
int main()
{        
    MAX = 20000;  //错误    
    int n = MAX;     
    printf（"n = %f\n",n）;//输出10000        
    return 0;
}

#include<stdio.h>
int main()
{      
     enum Sex s = MALE;       
     return 0;
}
``````c
    //性别enum Sex//枚举类型
{    //这种枚举类型的变量的未来可能取值          //枚举常量        
       MALE,        
       FEMALE,      
       SECRET
}