The problem of structure initialization in C language

// C
typedef struct {
    ElemSet e1;
    ElemSet e2;
    ElemSet e3;
}Triplet;

// 
Status InitTriplet(Triplet *t,ElemSet v1,ElemSet v2,ElemSet v3) {
    // 
    t = (Triplet *)malloc(sizeof(Triplet));
    if (!t) {
        // 
        return ERROR;
    }
    
    t->e1 = v1;
    t->e2 = v2;
    t->e3 = v3;
    return OK;
}

int main(int argc, const char * argv[]) {
    // insert code here...
    Triplet t;
    InitTriplet(&t, 10, 15, 20);
    printf("%p\n", &t);
    printf("%d\n", t.e2);
    t.e2 = 100;
    printf("%d\n", t.e2);
    return 0;
}

Why do I initialize it through the InitTriplet method and then get a value of 0 for e2 instead of the 15 I passed in?

C
Sep.18,2021

it's a mess.

first of all, the InitTriplet function doesn't work, because t is just a local variable. It has to be declared as Triplet * * . That's why your initialization doesn't work. Secondly, in the main function, t is already an automatic variable (memory has been automatically allocated on the stack). What is the purpose of applying for space for it?

I guess your purpose should be like this: 

Status InitTriplet(Triplet **t, ...);

int main(int argc, const char * argv[]) {
    Triplet *t = 0;
    InitTriplet(&t, 10, 15, 20);
    ...
}

Previous: The elCarousel of element shows that it is constantly triggered in the panel. Is there any way to destroy it?

Next: AndroidStudio can't recognize red rice 6Pro.

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e47920-665e5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e47920-665e5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?