this program print strange result
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#include <stdio.h>
#include <stdlib.h>

main()
{
char buffer[100];

char temp[100] = "453.2";

char outdata[100];

double ret;


memset(buffer,0x00,sizeof(buffer));
sprintf(buffer,"%%0%d.%df",30,20);
sprintf(outdata,buffer,atof(temp));


ret = atof(temp);

printf("outdata of ret =%030.20lf\n",ret);

printf("ret =%030.20lf\n",ret);

printf("outdata =%s\n",outdata);

printf("\n");

}
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result :
outdata of ret =000000453.19999999999999000000
ret =000000453.19999999999999000000
outdata =0000000000000000453.2000000000

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i think " ret = 0000000453.200000000000000000000 " should print
but the result was not , why ?

how do i repair this problem...
anyone who knows this, teach me !,,
i'll so appreciate you

bye