typedef in c

1.typedef: The typedef is used to give data type a new name. For example,

// After this line BYTE can be used 
// in place of unsigned char 
typedef unsigned char BYTE; 

int main() 
{ 
    BYTE b1, b2; 
    b1 = 'c'; 
    printf("%c ", b1); 
    return 0; 
}

2.How to use the typedef struct in C

Syntax

 

 

 

Method one:

struct Point{
  int x;
  int y;
};
typedef struct Point Point;
int main() {
    Point p1;
    p1.x = 1;
    p1.y = 3;
    printf("%d \n", p1.x);
    printf("%d \n", p1.y);
    return 0;
}

Method two:

typedef struct Point{
  int x;
  int y;
} Point;
int main() {
    Point p1;
    p1.x = 1;
    p1.y = 3;
    printf("%d \n", p1.x);
    printf("%d \n", p1.y);
    return 0;
}