Technorati 标签: strtol, strtoul, strtod
函数原型：
long int strtol ( const char * str, char ** endptr, int base );
unsigned long int strtoul ( const char * str, char ** endptr, int base );
double strtod ( const char * str, char ** endptr );
这几个函数从str指向的字符开始转化，忽略掉前面的空格，遇到错误无法转换的字符则返回，如果endptr不为空，则将该字符存储在endptr里。
对前两个函数，base则表示其进制。
想到之前的一篇笔记：/izualzhy/archive//07/09/182456.html
需要将”0xE4”转到E4(1个字节)
可以简单的这么写了：
char str[] = "E4";int a;a = strtol(str,NULL,16);
看个详细的例子：
/** =====================================================================================* Filename: strtodata.c* Description: string to long/unsigned long/double** Version: 1.0* Created: 08/16/ 07:30:17 PM** Author: zhy (), izualzhy@* =====================================================================================*/#include <stdio.h>#include <stdlib.h>int main(){char numbers[] = "2001 60c0c0 -1101110100110100100000 0x6fffff";char *pEnd;long int li1,li2,li3,li4;li1 = strtol(numbers, &pEnd, 10);li2 = strtol(pEnd, &pEnd, 16);li3 = strtol(pEnd, &pEnd, 2);li4 = strtol(pEnd, NULL, 0);printf("The decimal equivalents are: %ld, %ld, %ld, %ld.\n",li1,li2,li3,li4);char digits[] = "365.24 29.53 -1.23456"; double d1,d2,d3;d1 = strtod(digits, &pEnd);printf("%c\n", *pEnd);d2 = strtod(pEnd, &pEnd);d3 = strtod(pEnd, NULL);printf("The moon completes %f/%f orbits per Earth yes.%f\n",d1,d2,d3);return 0;}
运行结果：
The decimal equivalents are: 2001, 6340800, -3624224, 7340031.
The moon completes 365.240000/29.530000 orbits per Earth yes.-1.234560
====================================================================================================================================
/*
* =====================================================================================
*
* Filename: strtok.c
*
* Description: j
*
* Version: 1.0
* Created: 03月01日 18时34分13秒
* Revision: none
* Compiler: gcc
*
*Author: YOUR NAME (),
* Organization:
*
* =====================================================================================
*/
#include <stdio.h>
#include <string.h>
void split_str_to_intArray(char *pSeparator, char *pStr, int *pData)
{
char *pbuf;
int cnt = 0;
memset( pData, 0, sizeof( pData ) );
pbuf = strtok( pStr, pSeparator );
while( NULL != pbuf )
{
pData[ cnt ] = strtol( pbuf, NULL, 10);
pbuf = strtok( NULL, pSeparator );
cnt ++;
}
return;
}
int main(int argc, const char *argv[])
{
char a[] = "1,,,4..24..1.4.6.2435,2,34,234.3 414*";
int b[10];
int i;
memset( b, 0, sizeof( b ) );
split_str_to_intArray( ",. *", a, b );
for( i = 0; i < 10; i++)
printf("%d\n", b[i]);
return 0;
}
