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atof(½«×Ö·û´®×ª»»³É¸¡µãÐÍÊý)
atoi(½«×Ö·û´®×ª»»³ÉÕûÐÍÊý)
atol(½«×Ö·û´®×ª»»³É³¤ÕûÐÍÊý)
strtod(½«×Ö·û´®×ª»»³É¸¡µãÊý)
strtol(½«×Ö·û´®×ª»»³É³¤ÕûÐÍÊý)
strtoul(½«×Ö·û´®×ª»»³ÉÎÞ·ûºÅ³¤ÕûÐÍÊý)
toascii(½«ÕûÐÍÊýת»»³ÉºÏ·¨µÄASCII Âë×Ö·û)
toupper(½«Ð¡Ð´×Öĸת»»³É´óд×Öĸ)
tolower(½«´óд×Öĸת»»³ÉСд×Öĸ)
atof(½«×Ö·û´®×ª»»³É¸¡µãÐÍÊý)
Ïà¹Øº¯Êý atoi,atol,strtod,strtol,strtoul
±íÍ·Îļþ #include <stdlib.h>
¶¨Ò庯Êý double atof(const char *nptr);
º¯Êý˵Ã÷ atof()»áɨÃè²ÎÊýnptr×Ö·û´®,Ìø¹ýÇ°ÃæµÄ¿Õ¸ñ×Ö·û,Ö±µ½ÓöÉÏÊý
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('\0')²Å½áÊøת»»,²¢½«½á¹û·µ»Ø¡£²ÎÊýnptr×Ö·û´®¿É°üº¬Õý¸º
ºÅ¡¢Ð¡Êýµã»òE(e)À´±íʾָÊý²¿·Ö,Èç123.456»ò123e-2¡£
·µ»ØÖµ ·µ»Øת»»ºóµÄ¸¡µãÐÍÊý¡£
¸½¼Ó˵Ã÷ atof()ÓëʹÓÃstrtod(nptr,(char**)NULL)½á¹ûÏàͬ¡£
·¶Àý /* ½«×Ö·û´®a Óë×Ö·û´®bת»»³ÉÊý×ÖºóÏà¼Ó*/
#include<stdlib.h>
main()
{
char *a=”-100.23”;
char *b=”200e-2”;
float c;
c=atof(a)+atof(b);
printf(“c=%.2f\n”,c);
}
Ö´ÐÐ c=-98.23
atoi(½«×Ö·û´®×ª»»³ÉÕûÐÍÊý)
Ïà¹Øº¯Êý atof,atol,atrtod,strtol,strtoul
±íÍ·Îļþ #include<stdlib.h>
¶¨Ò庯Êý int atoi(const char *nptr);
º¯Êý˵Ã÷ atoi()»áɨÃè²ÎÊýnptr×Ö·û´®,Ìø¹ýÇ°ÃæµÄ¿Õ¸ñ×Ö·û,Ö±µ½ÓöÉÏÊý
×Ö»òÕý¸º·ûºÅ²Å¿ªÊ¼×öת»»,¶øÔÙÓöµ½·ÇÊý×Ö»ò×Ö·û´®½áÊøʱ
('\0')²Å½áÊøת»»,²¢½«½á¹û·µ»Ø¡£
·µ»ØÖµ ·µ»Øת»»ºóµÄÕûÐÍÊý¡£
¸½¼Ó˵Ã÷ atoi()ÓëʹÓÃstrtol(nptr,(char**)NULL,10);½á¹ûÏàͬ¡£
·¶Àý /* ½«×Ö·û´®a Óë×Ö·û´®bת»»³ÉÊý×ÖºóÏà¼Ó*/
#include<stdlib.h>
mian()
{
&
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