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。

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
    
      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
    
      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<
     
       ";    decimal2roman(250);     cout<<"\n1550 -> ";    decimal2roman(1550);     cout<<"\n670 -> ";    decimal2roman(670);     return 0;}
     
    

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c++中将字符串转化为数字