c++中将字符串转化为数字_在C和C ++中将十进制数转换为罗马数字

不念不忘少年蓝@ 2022-12-07 13:53 131阅读 0赞

![0757a0e090d2a9d697c34d6b9ae97827.png][]

c++中将字符串转化为数字

Here you will get program to convert decimal number to roman numeral in C and C++.

在这里，您将获得将C和C ++中的十进制数字转换为罗马数字的程序。

**How it Works?**

**这个怎么运作？**

*  Divide the given number in the order 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 to find largest base value.
    
    将给定数字按顺序依次除以1000、900、500、400、100、90、50、40、10、9、5、4、1，以找到最大底值。
 *  Display the corresponding roman symbol of largest base value obtained by above method in output.
    
    在输出中显示通过上述方法获得的最大基值的相应罗马符号。
 *  Subtract the given number with largest base value to get new number.
    
    减去具有最大基值的给定数字以获得新数字。
 *  Repeat above process with the new number until it becomes 0.
    
    对新数字重复上述过程，直到它变为0。

![Convert Decimal Number to Roman Numeral in C and C++][Convert Decimal Number to Roman Numeral in C and C]

**Example:**

**例：**

Decimal Number: 250

小数：250

*  Divide it in order 1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1 to find largest base value. Here 250 is divided by 100. The corresponding roman symbol for 100 is C.
    
    依次将其除以1000、900、500、400、100、90、50、40、10、9、5、4、1，以找到最大底值。 此处250除以100。100对应的罗马符号是C。
 *  Subtract 250 with 100 (largest base value in previous step) to get new number i.e. 150.
    
    用100(上一步中的最大基值)减去250以得到新的数字，即150。
 *  Again divide 150 in the order mentioned earlier. It is divided by 100, so corresponding roman symbol is C.
    
    再次按前面提到的顺序除以150。 它除以100，因此对应的罗马符号为C。
 *  Subtract 150 with 100 to get new number i.e. 50.
    
    用100减去150以得到新的数字，即50。
 *  Divide 50 again in the order mentioned earlier. 50 is divided by 50, so corresponding roman symbol is L.
    
    按照前面提到的顺序再次除以50。 50除以50，因此对应的罗马符号为L。
 *  Subtract 50 with 50. The new number obtained is 0 so we stop here.
    
    用50减去50。获得的新数字为0，因此我们在这里停止。
 *  The final roman numeral is **CCL**.
    
    最终的罗马数字是**CCL** 。

Below program implements above algorithm.

下面的程序实现上面的算法。

## 在C中将十进制数转换为罗马数字的程序 **(**Program to Convert Decimal Number to Roman Numeral in C**)** ##

#include<stdio.h>
     
    void decimal2roman(int num){
        int decimal[] = {1000,900,500,400,100,90,50,40,10,9,5,4,1}; //base values
        char *symbol[] = {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};  //roman symbols
        int i = 0;
     
        while(num){ //repeat process until num is not 0
            while(num/decimal[i]){  //first base value that divides num is largest base value
                printf("%s",symbol[i]);    //print roman symbol equivalent to largest base value
                num -= decimal[i];  //subtract largest base value from num
            }
            i++;    //move to next base value to divide num
        }
    }
     
    int main()
    {
        printf("250 -> ");
        decimal2roman(250);
     
        printf("\n1550 -> ");
        decimal2roman(1550);
     
        printf("\n670 -> ");
        decimal2roman(670);
     
        return 0;
    }

**Output**

**输出量**

*250 -> CCL* *1550 -> MDL* *670 -> DCLXX*

*250-> CCL* *1550-> MDL* *670-> DCLXX*

## 在C ++中将十进制数转换为罗马数字的程序 **(**Program to Convert Decimal Number to Roman Numeral in C++**)** ##

#include<iostream>
     
    using namespace std;
     
    void decimal2roman(int num){
        int decimal[] = {1000,900,500,400,100,90,50,40,10,9,5,4,1}; //base values
        char *symbol[] = {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};  //roman symbols
        int i = 0;
     
        while(num){ //repeat process until num is not 0
            while(num/decimal[i]){  //first base value that divides num is largest base value
                cout<<symbol[i];    //print roman symbol equivalent to largest base value
                num -= decimal[i];  //subtract largest base value from num
            }
            i++;    //move to next base value to divide num
        }
    }
     
    int main()
    {
        cout<<"250 -> ";
        decimal2roman(250);
     
        cout<<"\n1550 -> ";
        decimal2roman(1550);
     
        cout<<"\n670 -> ";
        decimal2roman(670);
     
        return 0;
    }

Comment below if you any queries related to above program.

如果您对以上程序有任何疑问，请在下面评论。

> 翻译自: [https://www.thecrazyprogrammer.com/2017/09/convert-decimal-number-roman-numeral-c-c.html][https_www.thecrazyprogrammer.com_2017_09_convert-decimal-number-roman-numeral-c-c.html]

c++中将字符串转化为数字

[0757a0e090d2a9d697c34d6b9ae97827.png]: /images/20221123/1436fa8f99714cd583067abe407e331b.png
[Convert Decimal Number to Roman Numeral in C and C]: /images/20221123/369a5daa13a643f1a3f8ee3b7e975d17.png
[https_www.thecrazyprogrammer.com_2017_09_convert-decimal-number-roman-numeral-c-c.html]: https://www.thecrazyprogrammer.com/2017/09/convert-decimal-number-roman-numeral-c-c.html