数值转换为单词

 

//32位数值，全局变量

 

static char *digits[] = {

"", "ONE ", "TWO ", "THREE ", "FOUR ", "FIVE ", "SIX ", "SEVEN ",

"EIGHT ", "NINE ", "TEN ", "ELEVEN ", "TWELVE ", "THIRTEEN ",

"FOURTEEN ", "FIFTEEN ", "SIXTEEN ", "SEVENTEEN ", "EIGHTEEN ",

"NINETEEN "

};

 

static char *tens[] = {

"", "", "TWENTY ", "THIRTY ", "FORTY ", "FIFTY ", "SIXTY ", "SEVENTY ",

"EIGHTY ", "NINETY "

};

 

static char *magnitudes[] = {

"", "THOUSAND ", "MILLION ", "BILLION "

};

 

static void

do_one_group( unsigned int amount, char *buffer, char **magnitude ){       //三位一组，并且调用递归。

   int value;    

   value = amount / 1000;

   if( value > 0 )

   do_one_group( value, buffer, magnitude + 1 );

 

    amount %= 1000;

    value = amount / 100;

    if( value > 0 ){

 

     strcat( buffer, digits[ value ] );

     strcat( buffer, "HUNDRED " );

    }

 

    value = amount % 100;

    if( value >= 20 ){

    strcat( buffer, tens[ value / 10 ] );

    value %= 10;

    }

 

    if( value > 0 )

    strcat( buffer, digits[ value ] );

    if( amount > 0 )

    strcat( buffer, *magnitude );

 }

 

void

written_amount( unsigned int amount, char *buffer ){

    if( amount == 0 )

     strcpy( buffer, "ZERO " );

   else {

    *buffer = ’/0’;                                                                            //后面用到了strcat

     do_one_group( amount, buffer, magnitudes );

   }

}

 

                                                                                                              ——原材料来自《POINTERS ON C》