C语言 double转字符串_追梦海星

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C语言 double转字符串

(2013-06-11 08:50:32)

分类：工具相关

char   *ecvt(double value,int ndigit,int *decpt,int *sign)
         将浮点数value转换成字符串并返回该字符串
char   *fcvt(double value,int ndigit,int *decpt,int *sign)
         将浮点数value转换成字符串并返回该字符串

函数名: ecvt
功  能: 把一个浮点数转换为字符串
用  法: char ecvt(double value, int ndigit, int *decpt, int *sign);
程序例:
#include
#include
#include

int main(void)
{
   char *string;
   double value;
   int dec, sign;
   int ndig = 10;

   clrscr();
   value = 9.876;
   string = ecvt(value, ndig, &dec, &sign);
   printf("string = %s      dec = %d \
   sign = %d\n", string, dec, sign);

   value = -123.45;
   ndig= 15;
   string = ecvt(value,ndig,&dec,&sign);
   printf("string = %s dec = %d sign = %d\n",
   string, dec, sign);


   value = 0.6789e5;
   ndig = 5;
   string = ecvt(value,ndig,&dec,&sign);
   printf("string = %s           dec = %d\
   sign = %d\n", string, dec, sign);

   return 0;
}

函数名: fcvt
功  能: 把一个浮点数转换为字符串
用  法: char *fcvt(double value, int ndigit, int *decpt, int *sign);
程序例:

#include
#include
#include

int main(void)
{
   char *string;
   double value;
   int dec, sign;
   int ndig = 10;

   clrscr();
   value = 9.876;
   string = ecvt(value, ndig, &dec, &sign);
   printf("string = %s      dec = %d \
          sign = %d\n", string, dec, sign);

   value = -123.45;
   ndig= 15;
   string = ecvt(value,ndig,&dec,&sign);
   printf("string = %s dec = %d sign = %d\n",
          string, dec, sign);


   value = 0.6789e5;
   ndig = 5;
   string = ecvt(value,ndig,&dec,&sign);
   printf("string = %s           dec = %d\
          sign = %d\n", string, dec, sign);

   return 0;
}

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