这是我的德州老扑克计划的代码：
我已经尝试了几个小时的调试，并且到处寻找！我对指针和使用malloc的知识可能有一些非常基本的缺陷，但我不知道为什么会这样：
程序编译正常并且运行正常，直到它到达malloc函数，试图为卡片变量卡* individualhand分配一个内存地址。在确认它之前的printf if语句是一个NULL指针并且可以被分配。
还包括其他一些功能。打印手（打印扑克牌和非法牌（检测非法卡输入）我省略了。
这可能是很多代码，但我觉得答案非常简单
错误发生在handget函数中，大约是代码的一半：
int hander(cards **handPtr,int counter) {
int i, nr_of_cards = 2;
char rawsuit, rawcard[4];
if(counter==0){
// allocate the required amount of memory for your cards
(*handPtr) = (cards *) malloc(nr_of_cards * sizeof(cards));
}
// ask for the cards
for (i=0; i<nr_of_cards; i++) do {
scanf("%3s", &rawcard);
rawsuit = rawcard[0];
if (rawcard[1]=='1') {
if (rawcard[2]=='0') {
(*handPtr)[i].value = ten;
} else {
(*handPtr)[i].value = zero;
}
} else if (rawcard[1]=='2') {
(*handPtr)[i].value = two;
} else if (rawcard[1]=='3') {
(*handPtr)[i].value = three;
} else if (rawcard[1]=='4') {
(*handPtr)[i].value = four;
} else if (rawcard[1]=='5') {
(*handPtr)[i].value = five;
} else if (rawcard[1]=='6') {
(*handPtr)[i].value = six;
} else if (rawcard[1]=='7') {
(*handPtr)[i].value = seven;
} else if (rawcard[1]=='8') {
(*handPtr)[i].value = eight;
} else if (rawcard[1]=='9') {
(*handPtr)[i].value = nine;
} else if (rawcard[1]=='J') {
(*handPtr)[i].value = jack;
} else if (rawcard[1]=='Q') {
(*handPtr)[i].value = queen;
} else if (rawcard[1]=='K') {
(*handPtr)[i].value = king;
} else if (rawcard[1]=='A') {
(*handPtr)[i].value = ace;
} else {
(*handPtr)[i].value = zero;
}
switch (rawsuit) {
case 'h':
(*handPtr)[i].suit = hearts;
break;
case 'd':
(*handPtr)[i].suit = diamonds;
break;
case 'c':
(*handPtr)[i].suit = clubs;
break;
case 's':
(*handPtr)[i].suit = spades;
break;
default:
(*handPtr)[i].value = zero;
}
} while (!islegal(*handPtr, i+1));
return nr_of_cards;
}
int handget(cards **playerhand,cards *thishands, int handsize) {
cards *player,*individualhand=NULL;
int i,playerhandsize=2,j=0,nr_players,phandsize,counter=0, individualhandsize;
printf("Please enter the number of players: ");
scanf("%d",&nr_players);
(*playerhand) = (cards *) malloc(((playerhandsize*nr_players)*sizeof(cards))+(handsize*sizeof(cards)));
handcat(playerhand,thishands,handsize);
for (i=1;i<=nr_players;i++){
do {
printf("Please enter the cards for player %d: ",i);
phandsize = (i*hander(&player,counter))+handsize;
playerflopcat(playerhand,player,j,phandsize,handsize);
counter++;
} while (!islegal(*playerhand, phandsize));
j++;
}
printf("The cards on the table are:\n");
printhand(thishands,handsize);
for (i=1;i<=nr_players;i++){
printf("The private cards of player %d are ",i);
printhand(*playerhand+(handsize+(2*(i-1))),2);
}
for (i=1;i<=nr_players;i++){
individualhandsize = handsize + playerhandsize;
printf("individualhandsize=%i\n",individualhandsize);
if(individualhand==NULL){
printf("individualhand EQUALS NULL!");
}
individualhand=((cards *) malloc(individualhandsize*sizeof(cards)));//THIS IS WHERE IT ALL GOES WRONG!!
printf("made it this far chaps!!\n");
memcpy(individualhand,playerhand,individualhandsize*sizeof(cards));
printf("made it this far chaps!!\n");
printf("The cards available to player %d are ",i);
/*i have yet to add code here*/
}
return nr_players;
}
void handcat(cards **playerhand,cards *playerx, int nr_cards){
memcpy(*playerhand,playerx,nr_cards*sizeof(cards));
return;
}
void playerflopcat(cards **playerhand,cards *playerx,int j, int nr_cards,int handsize){
memcpy((*playerhand+(handsize+(2*j))),playerx,nr_cards*sizeof(cards));
return;
}
我用来调用函数handget的方法：
int main(void) {
int handsize=0, playerhandsize=0, nr_of_players=0;
cards *thishand, *playerhands;
handsize = flop(&thishand);
//flop asks user for list of cards
//user inputs(e.g. "d5 d6 d7 d8 d9")
//flop returns int handsize=5
printhand(thishand,handsize);
//printhand returns a list (of handsize length) of the cards making up thishand
//e.g. "d5 d6 d7 d8 d9"
nr_of_players = handget(&playerhands,thishand,handsize);
//handget is the function we're looking at
//takes thishand which was assigned (using function flop) to a space in memory containing list of cards ("d5 d6 d7 d8 d9")
//also uses int handsize = 5
//playerhands is assigned in function handget
// printhand(playerhands,(handsize+(nr_of_players*2)));
return 0;
}
为了完整起见，我已经包含了功能翻转
int flop(cards **handPtr) {
int i,*q=NULL,n=NULL;
int j[5]={0,0,0,0,0};
int k[5]={1,1,1,1,1},nr_of_cards = 5;//for more/less cards CHANGE HERE!
char rawsuit, rawcard[4];
// allocate the required amount of memory for your cards
(*handPtr) = (cards *) malloc(nr_of_cards * sizeof(cards));
n=memcmp(j,k,sizeof(j));
while(n!=0) {
printf("Please input the five cards on the table: ");
q=rawtoflop(*handPtr,nr_of_cards);
for (i=0;i<nr_of_cards;i++) {
j[i]=*(q+i);
}
n=memcmp(j,k,sizeof(j));
}
return nr_of_cards;
}
islegal的代码：
int islegal(cards *hand, int nr_of_cards) {
int i, fulldeck[4][13]={0};
int current_value, current_suit;
cards *current_card = hand;
int legal = 1;
for (i=0; i<nr_of_cards; i++) {
current_value = (int) (*current_card).value;
current_suit = (*current_card).suit;
// if the current card has value zero, it is not a valid hand
if (current_value==0) {
legal = 0;
break;
}
//check if the current card already appears, if yes invalid hand, if no,
//change the flag for that card in the full deck.
//Since (two) will correspond to fulldeck[.][0] there is a -2 offset.
if ( (fulldeck[current_suit][current_value - 2]) > 0 ) {
legal = 0;
break;
} else {
fulldeck[current_suit][current_value - 2]++;
}
current_card++;
}
return legal;
}
答案 0 :(得分：1)
您正在将函数handget称为：
nr_of_players = handget(&playerhands,thishand,handsize);
没关系，它会编译，因为handget确实期望cards **。但是，您从未为cards **分配空间。playerhands仍然是cards*并且获取其地址并尝试分配内存，这可能是malloc失败的原因。
您是否可以通过声明cards ** playerhands而不是当前的card *来尝试运行此功能？