关于C#：随机数（加法游戏）问题

Random Number (addition game) issue

我正在做一个加法/乘法游戏，为我的C课介绍。这个程序的目标是询问用户，您想要使用的最大值是什么，它将在最大范围内随机设定数字，以及您想要做多少不同的问题。当我运行程序进行数学运算时，它告诉我求和不正确，并提供了一个不正确的答案，通常是一个大数字，如"1254323"。你能指出我做错了什么吗？

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

int main() {

int maxNumber, num1, num2, sum, answer, problems, i;

srand(time(NULL));

//printf("Would you like 1)Addition or 2)Multiplication?
")
printf("Enter your Max Number:");
scanf("%d", &maxNumber);

printf("How many problems do you want?
");
scanf("%d", &problems);

sum = num1 + num2;

while(i != problems) {
num1 = rand()%maxNumber;
num2 = rand()%maxNumber;
i++;

printf("What is %d + %d
",num1, num2);
scanf("%d", &answer);

if(answer != sum){
printf("Sorry, that's incorrect, the answer is %d
", sum);
}

else{
printf("Correct!
");
}
}

return 0;
}

相关讨论

您使用的变量没有初始化它们。更改：

1	int maxNumber, num1, num2, sum, answer, problems, i;

号

到：

1	int maxNumber = 0, num1 = 0, num2 = 0, sum = 0, answer = 0, problems = 0, i = 0;

另外，将sum = num1 + num2;行移到创建num1和num2之后。

相关讨论

在设置num1和num2之前，您要分配sum。

将sum = num1 + num2;线移到num2 = rand()%maxNumber;线后的回路中，应能正常工作。

还有一些其他错误(例如用0初始化i)。

顺便说一句，通常认为使用for循环而不是while循环是更好的做法。

这里的代码可读性稍高一些

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

int main(){
int maxNumber, num1, num2, sum, answer, problems, i;
srand(time(NULL));

printf("Enter your Max Number:");
scanf("%d", &maxNumber);

printf("How many problems do you want?
");
scanf("%d", &problems);

for (i = 0; i < problems; i++) {
num1 = rand()%maxNumber;
num2 = rand()%maxNumber;
sum = num1 + num2;

printf("What is %d + %d
",num1, num2);
scanf("%d", &answer);

if(answer != sum){
printf("Sorry, that's incorrect, the answer is %d
", sum);
} else {
printf("Correct!
");
}
}

return 0;
}

相关讨论

您定义sum=num1+num2，其中num1和num2根本没有被分配。默认情况下，C不会初始化数字为零。这就是为什么你有这么大的数字。

在num2 = rand()%maxNumber;之后加上sum = num1 + num2，一切都会好起来的！

您的程序存在多个问题，包括格式设置。以下是更正：

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

int main(){
int maxNumber, num1, num2, sum, answer, problems, i;

srand(time(NULL));

//printf("Would you like 1)Addition or 2)Multiplication?
")
printf("Enter your Max Number:");
scanf("%d", &maxNumber);

printf("How many problems do you want?
");
scanf("%d", &problems);

// issue: i was not initialized
i = 0;
while(i != problems){
i++;
num1 = rand()%maxNumber;
num2 = rand()%maxNumber;

printf("What is %d + %d
", num1, num2);
// issue: sum was not calculated here
sum = num1 + num2;
scanf("%d", &answer);

if(answer != sum){
printf("Sorry, that's incorrect, the answer is %d
", sum);
}
else{
printf("Correct!
");
}
}
return 0;
}

。

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