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#include <stdio.h>
 
struct Card {
    int number;
    char face[];
    char suit[];
};
 
 
 
int main(){
    Card deck;
    deck.number = 5; //for debug
    char face[] = "Ace"; //for debug
    deck.face[] = "Ace";
    deck.suit[] = "Hearts";
    printf("s of s\n",deck.face,deck.suit);
    return 0;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:15:15: error: expected primary-expression before ‘]’ token
     deck.face[] = "Ace";
               ^
prog.cpp:16:15: error: expected primary-expression before ‘]’ token
     deck.suit[] = "Hearts";
               ^
prog.cpp:17:42: warning: too many arguments for format [-Wformat-extra-args]
     printf("s of s\n",deck.face,deck.suit);
                                          ^
prog.cpp:14:10: warning: unused variable ‘face’ [-Wunused-variable]
     char face[] = "Ace"; //for debug
          ^

Standard output is empty