Question

How to define and use global struct in C

Answer 1

#include <stdio.h>

struct point 
{
    int x;
    int y;
};

struct point left_point;

int main(int argc, char **argv) 
{ 
    left_point.x = 100;
    left_point.y = 30;
    
    printf("%d\n", left_point.x); // 100
    printf("%d\n", left_point.y); // 30
    
    return(0);
}


/*
run:

100
30

*/

 

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Answer 2

#include <stdio.h>

struct point 
{
    int x;
    int y;
};

struct point left_point;

void printStruct(struct point p);

int main(int argc, char **argv) 
{ 
    left_point.x = 100;
    left_point.y = 30;
    
    printStruct(left_point);
    
    return(0);
}

void printStruct(struct point p)
{
    printf("%d\n", p.x); 
    printf("%d\n", p.y); 
}

/*
run:

100
30

*/

 

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