用户将未知数量的整数放入数组中(动态)。程序必须以相反的顺序输出这些数字,例如: 整数顺序相反。 Exmp。 324,12,5987 - > 423,21,7895 Exmp。 123,100 - > 321,1(两个0' s被删除)
我不确定自己是否走在正确的道路上,但我真诚地希望有人能建议我找到解决方案。 现在,我收到错误的“分段错误”'''' - 它可能与数组空间有关吗?
这是我目前的代码:
int main()
{
int n,sk,rez;
int *a;
cout << "How many integers will there be? : " << endl;
cin >> sk;
a = new int[sk];
for (int i = 0; i < sk; i++)
{
cout << "Write an integer: " << endl;
cin >> n;
a[i] = n;
}
for (int i = 0; i < sk; i++)
{
// Gets amount of the digits of every integer.
int count, new_num = 0;
int* skaits;
while(a[i] > 0)
{
count++;
a[i] = a[i]/10;
}
skaits = new int [count];
for (int j = 0; j<count; j++)
{
skaits[j] = count; // Exmp. I write 324,12 , loop calculates 3 and 2 and puts that amount in an array.
// Loop to output integers in reverse order. Exmp. 324,12,5987 --> 423, 21, 7895
for (int k = 0; k<skaits[j]; k++)
{
new_num = new_num * 10 + (a[k] % 10);
a[k] = a[k]/10;
}
cout << new_num << endl;
}
}
delete []a;
return 0;
}
答案 0 :(得分:2)
作为一般规则:尝试使您的代码更加模块化。我希望找到一个计算单个数字反转的函数。这更容易编写,更容易调试,因为您将两个任务分开:收集数据,反转整数。
无论如何,深入研究代码:似乎在计算count
之后,变量a[i]
的内容已被销毁...(a[i]==0
退出{ {1}}循环)。
一种反转十进制数的简单方法:
while
答案 1 :(得分:1)
由于segmentation fault
未初始化,因此count
出现。
我在你的程序中发现了很多错误,例如:
int count, new_num = 0;// here count is not initialized also need count=0;
int* skaits;
while(a[i] > 0)
{
count++; // without initialize how you increase count
a[i] = a[i]/10;
}// after this your number in a[i] is become 0. so what will you find
skaits = new int [count];// no need extra skaits. you have count already
最好使用函数来反转a[i]
的每个数字。
long reverse(long n) {
static long r = 0;
if (n == 0)
return 0;
r = r * 10;
r = r + n % 10;
reverse(n/10);
return r;
}
你可以这样做:
for(int i=0;i<sk;i++)
{
int new_num=reverse(a[i);
a[i]=new_num;
cout<<a[i]<<endl;
}
或者你可以这样做:
for (int i = 0; i < sk; i++)
{
cout << "Write an integer: " << endl;
cin >> n;
a[i] = n;
}
for (int i = 0; i < sk; i++)
{
// Gets amount of the digits of every integer.
int reverse=0;
while (a[i] != 0)
{
reverse = reverse * 10;
reverse = reverse + a[i]%10;
a[i]= a[i]/10;
}
cout<<reverse<<endl;
}
另一种方法是,首先先为每个数字int to string
,然后再reverse
。