Question

我想创建一个骰子游戏，但它总是说我的猜测是错误的，并且为什么这么说。我终于明白了如何使rand函数实际上是随机的btw：D 我认为这是因为数组没有正确存储字符串。

int main()
{

srand(time(NULL));
int dice1 = 1, dice2 = 1, dice3 = 1, sum, key = 0;
int dice4 = 1, dice5 = 1, dice6 = 1, sum2;
char randomnumber[10];

printf("Diceroll-game \n\n");
printf("The first sum is:\n");


dice1 = (rand()%6 + 1);
dice2 = (rand()%6 + 1);
dice3 = (rand()%6 + 1);

sum = dice1 + dice2 + dice3;

printf("%d\n", sum);

printf("Will the next sum of 3 dices be higher(hi), lower (lo) or the same(sa) (hi, lo, sa)?\n");
printf("Type hi, lo or sa\n");

scanf("%c \n", &randomnumber);

dice4 = (rand()%6 + 1);
dice5 = (rand()%6 + 1);
dice6 = (rand()%6 + 1);

sum2 = dice4 + dice5 + dice6;

if (randomnumber == "hi" && sum2 > sum) {
   printf("You were right !\n\a");

}else {
    if (key == 0) {
printf("You were wrong.");
key = 1;
}
}


if (randomnumber == "lo" && sum2 < sum) {
   printf("You were right !\n\a");

}else {
    if (key == 0) {
printf("You were wrong.");
key = 1;
}
}


if (randomnumber == "sa" && sum2 == sum) {
   printf("You were right !\n\a");

}else {
    if (key == 0) {
printf("You were wrong.");
key = 1;
}
}



printf("\nIt's %d", sum2);

return 0;

是的，请有人帮帮我。谢谢。

Answer 1

首先，您在这里使用了错误的格式说明符。 %c用于扫描一个char。您需要将%s用于字符串。使用错误的格式说明符调用undefined behaviour。

然后，您提供给scanf()的格式字符串需要与输入完全匹配。你在那里不需要newline。

此外，randomnumber是一个数组，在使用&参数时添加scanf()不是必需的。

更改
```
scanf("%c \n", &randomnumber);
```
到
```
scanf("%s", randomnumber);
```
其次，无法使用==运算符完成字符串comaprisons。您需要使用strcmp()来比较两个字符串内容。

更改
```
.. randomnumber == "hi" ...
```
到
```
..  !strcmp(randomnumber, "hi")   ...
```

Answer 2

三个问题：

您使用错误的格式说明符来扫描字符串。 %c用于char，%s用于字符串。所以改变
```
scanf("%c \n", &randomnumber);
```
到
```
scanf("%s", randomnumber);
```
我做的其他更改是删除\n和空格字符，因为它不会停止扫描，直到非空格字符，这可能不是您想要的。此外，%s还需要char*。 &randomnumber类型为char(*)[10]，而randomnumber转换为&randomnumber[0]，char*，这正是%s想要拥有的内容。

在C中，当您使用==比较字符串时，您需要比较指针而不是实际内容。要比较内容，请添加string.h并使用strcmp。如果两个字符串相等，则返回0。所以改变以下内容：

if (randomnumber == "hi" && sum2 > sum) {
if (randomnumber == "lo" && sum2 < sum) {
if (randomnumber == "sa" && sum2 == sum) {

到

if (strcmp(randomnumber, "hi") == 0 && sum2 > sum) {
if (strcmp(randomnumber, "lo") == 0 && sum2 < sum) {
if (strcmp(randomnumber, "sa") == 0 && sum2 == sum) {

现在，在你解决了其他问题之后，你会注意到有些东西打印了两次，这可能不是你想要的。原因是您有if个strcmp个"You were right !\n"。只有一个可以是真实的，将打印"You were wrong."，其余的将打印if (strcmp(randomnumber, "hi") == 0 && sum2 > sum) { printf("You were right !\n\a"); }else { if (key == 0) { printf("You were wrong."); key = 1; } } if (strcmp(randomnumber, "lo") == 0 && sum2 < sum) { printf("You were right !\n\a"); }else { if (key == 0) { printf("You were wrong."); key = 1; } } if (strcmp(randomnumber, "sa") == 0 && sum2 == sum) { printf("You were right !\n\a"); }else { if (key == 0) { printf("You were wrong."); key = 1; }。通过更改
来修复它
```
if (strcmp(randomnumber, "hi") == 0 && sum2 > sum) {
   printf("You were right !\n\a");
}else if(strcmp(randomnumber, "lo") == 0 && sum2 < sum) {
   printf("You were right !\n\a");
}else if(strcmp(randomnumber, "sa") == 0 && sum2 == sum) {
   printf("You were right !\n\a");
}else {
    if (key == 0) {
       printf("You were wrong.");
    key = 1;
}
```
到
```
key
```

请注意，img.onload = function(callback){变量在您的程序中是多余的。

C diceroll游戏

2 个答案: