code for converting float to string

I think you're looking for sprintf().

Which isn't Keil-specific, by the way, but part of the standard libraries.

maybe you can write his code;
for example;

- specify your string array

unsigned char str_float[20];

.
-find the maximum divider, and number of digit at left side of comma

if(float_number<10) {divider=1;digit=1}
if(float_number<100) {divider=10;digit=2}
if(float_number<1000) {divider=100;digit=3} ... etc

.

-and how much digit you want at right side of comma, for example you want two digit from right side of comma, multiply with 100 and convert to long

long_value=(unsigned long)float_value*100;
digit+=2;
divider*=100;

.
--and now start take digits

str_float[digit+2]="\0";

while(digit>2){
str_float[digit+1]=long_number/(divider) + "0" ;
long_number/=10;
divider/=10;
digit--;
}

str_float[2]=",";
str_float[1]=long_number/10+"0";
str_float[0]=long_number%10+"0";

.

i know this code very weak, powerless, i write this only for give an idea. for example float_value=0,54 this code fails

www.google.com/codesearch

// This code converts the given float values to a string
// input argumentsto the function are 1. Float value that to be converted 2. Number of digits at the output string 3. The string variable to store the converted results

/* Perfect float to string Conversion c program */

#include <stdio.h>

void ftostr(double num, int digits,char *buff)
{
int i_temp = (int)num;

float f_temp = num-i_temp;

char temp_s[20];
int i_len = i_temp>0 ?1:2;

int ref_len = i_len;
int var = i_temp;

while(var)
{
i_len += 1;
var /=10;
}

int temp_len = i_len;

for(int i=0;i<digits;i++)
{
if(temp_len==ref_len)
{
temp_s[i_len-2-i]='0' + i_temp%10;
temp_len -= 1;
}
else if(temp_len>ref_len)
{
temp_s[i_len-2-i]='0' + i_temp%10;
i_temp /= 10;
temp_len -= 1;
}
if(i_len-1 == i)
{
temp_s[i] = '.';
temp_len -= ref_len==2?1:0;
}
else if(temp_len == 0)
{
temp_s[i] =(int)(f_temp*10)+'0';
f_temp = f_temp *10;
f_temp = f_temp - (int)f_temp;
}
}

for(int i=0;i<=digits;i++)
{
buff[i] = temp_s[i];
}
}

int main()
{
float a = 10.2563;
char tx[100];

ftostr(a,10,tx);

printf("\n %s",tx);

return 0;
}

void float_to_char(char *total_str,float value)
{
int ipart=(int)value; //Extracting interger part only
float fpart=value-(int)value; //Extracting floating value only
int reversed=0;
int i=0;
char istring[100];
if(ipart==0)
{
istring[0]='0';
}
else
{
while(ipart>0)
{
reversed=reversed*10 + ipart%10; //Reversing integer
ipart=ipart/10;
}
}
while(reversed>0)
{
istring[i]=reversed%10+'0'; //Adding digits to string array
reversed=reversed/10;
i++;
}
char fstring[100];
int k = 0;
float x= fpart;
fstring[k]='.'; //Adding . as decimal point
k++;
for(int j=0;j<6;j++)
{
x=x*10;
fstring[k]='0'+(int)x;
x=x-(int)x;
k++;
}

int len = strlen(istring); //Length of integer string
for(int i=0;i<100;i++)
{
if(istring[i]!='\0')
{
total_str[i]=istring[i]; //Grouping integer string and floating value string
}
else if(fstring[i]!='\0')
{
total_str[i]=fstring[i-len];
}
}
}