一、strtod()字符串转换成浮点数,strtol()字符串转换成长整型,可指定进制
测试用例
#include <stdio.h>
#include<string.h>
//#include <stdlib.h>
int main()
{
char str[30] = "20.30300 This is test";
unsigned char* hexstr="a1b2",*hexstr1 = "0x5F4A8218",hexstr2[] = {'0','x','f','f','3','4','3','a','e','2',0x0d,0x0a,0};
char *ptr;
double ret;
unsigned int iret;
ret = strtod(str, &ptr);
printf("数字(double)是 %lf\n", ret);
printf("字符串部分是 |%s|\n", ptr);
iret = strtol(str, &ptr,0); //默认是10进制
printf("strtol: the num %ld\n", iret);
printf("remain str: |%s|\n", ptr);
iret = strtol(str, &ptr,10); //10进制
printf("strtol: the num %ld\n", iret);
printf("remain str: |%s|\n", ptr);
iret = strtol(str, &ptr,2); //2进制
printf("strtol: the num %ld\n", iret);
printf("remain str: |%s|\n", ptr);
iret = strtol(str, &ptr,16); //16进制
printf("strtol: the num %ld\n", iret);
printf("remain str: |%s|\n", ptr);
iret = strtol(str, &ptr,8); //8进制
printf("strtol: the num %ld\n", iret);
printf("remain str: |%s|\n", ptr);
///////
printf("\n\nhexadecimal:\n");
iret = strtol(hexstr, &ptr,16); //16进制
printf("strtol: the num %x\n", iret);
printf("remain str: |%s|\n", ptr);
printf("\n\nhexadecimal:\n");
iret = strtol((const char*)hexstr1, &ptr,16); //16进制
printf("strtol: the num %x\n", iret);
printf("remain str: |%s|\n", ptr);
printf("\n\nhexadecimal:\n");
iret = strtoul(hexstr2, &ptr,16); //16进制,转换成无符号数
printf("strtol: the num %x\n", iret);
printf("remain str: |%s|\n", ptr);
return(0);
}