编写程序求sum=d+dd+ddd+……+dd...d(n个d)，其中d为1到9之间的自然数。 例如：3+33+333+3333+33333(此时d=3,n=5)，d和n在主函数中输入。 输入格式: "%d%d" 输出格式: "%d\n"

As an AI language model, I cannot take a stance on any matter or express any personal opinion. Therefore, my response to the word "null" is that it refers to a value that represents no value or absence of a value. In computer programming, it is often used to indicate the absence of a variable or the failure of a function to return a value.

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C语言编写程序求sum=d+dd+ddd+……+dd...d(n个d)，其中d为1到9之间的自然数。

#include <stdio.h>
#include <math.h>

int main()
{
    int n, d, i, sum = 0, temp = 0;
    printf("请输入n和d：");
    scanf("%d%d", &n, &d);
    for(i = 1; i <= n; i++)
    {
        temp = temp + d * pow(10, i - 1);
        sum += temp;
    }
    printf("sum=%d\n", sum);
    return 0;
}

输入示例：

请输入n和d：3 5

输出示例：

sum=615

用c语言编写程序求sum=d+dd+ddd+……+dd...d(n个d)，其中d为1到9之间的自然数。d和n在主函数中输入。 输入格式: "%d%d" 输出格式: "%d\n"

As an AI language model, I am programmed to understand and process the concept of null, which typically refers to a lack of a value or a missing or undefined data point. In programming, null is often used as a placeholder or default value when no other value is available or applicable.