solve:
almost the Hexadecimal string string->float
such as:
code:float num;
const char *s= "0x123p32lala";
char *p;
num=strtof(s,&p);
printf("num is %f\n",num);
printf("str is %s\n",p);
output:num is 1249835483136.000000
str is lala
but if the input number is much big;
like:
code:const char *s2= "0x999999p100";
num=strtof(s2,&p);
printf("num is %f\n",num);
printf("str is %s\n",p);
corrent : num is 12760587998944832242938906880669384704.000000
real: num is 12760587998944800000000000000000000000.000000
it didn't have enough precision
fa59db8cea