//-std=c99 -Wall -Wextra -Wpedantic -Wshadow

#include <stdio.h>
#include <stdlib.h>

struct st1{
    int a;
    int b;
};

typedef struct st2{
    int a;
    int b;
} St2;

typedef struct{
    int a;
    int b;
} St3;

struct{
    int a;
    int b;
} st4 = { 10, 11 };

int main()
{

    struct st1 s1;

    s1.a = 2;
    s1.b = 3;

    printf("%d %d\n", s1.a, s1.b);

    struct st2 s2a;

    s2a.a = 4;
    s2a.b = 5;

    printf("%d %d\n", s2a.a, s2a.b);

    St2 s2b;

    s2b.a = 6;
    s2b.b = 7;

    printf("%d %d\n", s2b.a, s2b.b);

    St3 s3;

    s3.a = 8;
    s3.b = 9;

    printf("%d %d\n", s3.a, s3.b);

    printf("%d %d\n", st4.a, st4.b);

    return 0;
}