我想将整数转换为C中的数组,这是我的代码,它大致可行。

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英文:

I want to convert integer into an array in C and this is my code and it kind of works

问题

我正在学习C,我遇到了一个问题,我想将整数转换为数组,我的代码可以工作,但问题是我在开始时声明了数组的大小,我希望能够使其适用于任何整数。

英文:

Im learning C right now and I've got this problem I want to convert the integer into an array my code works but the problem is that I declare the size of an array in the beginning and I want to make it so that it works for every integer basically.

#include<stdio.h>
int main()
{
	int x,i,temp;
	int arr1[6];
	scanf("%d",&x);
	for (i=5;i>=0;i--){
		temp=x%10;
		arr1[i]=temp;
		x/=10;
	}
	
	for (i=0;i<=5;i++){
		printf("%d",arr1[i]);
	}
	
	return 0;
}

Can you please help me?

I'm trying to find solution for the problem.

答案1

得分: 0

以下是翻译好的部分:

"For starters your code does not take into account that the user can enter a negative number."

  • 首先,您的代码没有考虑用户可能输入负数。

"If you are not going to deal with negative values then declare the variable x as having an unsigned integer type as for example unsigned int."

  • 如果您不打算处理负值,那么可以将变量 x 声明为无符号整数类型,例如 unsigned int

"As for your problem then you can use a variable length array."

  • 至于您的问题,您可以使用可变长度数组。

"For example"

  • 例如,

如果您的编译器不支持可变长度数组,那么您可以使用标准函数 malloc 在头文件 <stdlib.h> 中动态分配一个数组,如下所示:

"unsigned int *a = malloc( n * sizeof( *a ) );"

  • unsigned int *a = malloc( n * sizeof( *a ) );
英文:

For starters your code does not take into account that the user can enter a negative number.

If you are not going to deal with negative values then declare the variable x as having an unsigned integer type as for example unsigned int.

As for your problem then you can use a variable length array.

For example

#include <stdio.h>

int main( void )
{
    unsigned int x;

    if ( scanf( "%u", &x ) == 1 )
    {
        size_t n = 0;
        unsigned int tmp = x;

        do 
        {
            ++n;
        } while ( tmp /= 10 );

        unsigned int a[n];

        for ( size_t i = n; i != 0; x /= 10 )
        {
            a[--i] = x % 10; 
        }

        for ( size_t i = 0; i < n; i++ )
        {
            printf( "%u ", a[i] );
        }
        putchar( '\n' );
    }
}

If your compiler does not support variable length arrays then you can allocate an array dynamically using standard function malloc declared in header <stdlib.h> as for example

unsigned int *a = malloc( n * sizeof( *a ) );

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  • 本文由 发表于 2023年2月6日 04:31:19
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