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浮点数转换成字符串函数

sprintf函数太大,在STM8上面根本不敢用,动不动就.text overflow。为了将采集的数值通过串口上传到计算机,只能自己写了一个浮点数转换成字符串的函数:

#include <stdio.h>#include <stdint.h>static char table[]={0, 1, 2, 3, 4, 5, 6, 7, 8, 9};void num2char(char *str, double number, uint8_t g, uint8_t l){    uint8_t i;    int temp = number/1;    double t2 = 0.0;    for (i = 1; i<=g; i++)    {        if (temp==0)            str[g-i] = table[0];        else            str[g-i] = table[temp%10];        temp = temp/10;    }    *(str+g) = .;    temp = 0;    t2 = number;    for(i=1; i<=l; i++)    {        temp = t2*10;        str[g+i] = table[temp%10];        t2 = t2*10;    }    *(str+g+l+1) = \0;}int main(int argc, char const *argv[]){    char str[20];    num2char(str, 23.56821312, 8, 10);    printf("%s\n", str);    return 0;}

测试结果如下:

00000023.5682131