数字小写转大写方法，仅供学习

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
bool ChgLowerToUpper(int ivalue, char *svalue);
void GetUpperFromLower(int ival, char *supp);
bool GetHandreUpper(int ivalue, char *svalue);
bool GetThousandUpper(int ivalue, char *svalue);
bool GetAllUpper(int ivalue, char *svalue);
int main(int argc, char ** argv)
{
 if(argc != 2)
 {
  perror("num of paramter is error!\n");
  return 1;
 }
 char * strvar = *(argv + 1);
 int value = atoi(strvar);
 char * strvalue = "";
 if(ChgLowerToUpper(value,strvalue))
 {
  printf("%d = %s\n", value, strvalue);
  return 0;
 }
 return 1;
}
bool ChgLowerToUpper(int ivalue, char *svalue)
{
  printf("ChgLowerToUpper\n");
  printf("ivalue = [%2d]\n", ivalue);
        svalue = "";

        //分阶段考虑
        if(ivalue == 0)
        {
                GetUpperFromLower(ivalue,svalue);
        }
        else if((ivalue > 0)&&(ivalue < 10000))
        {
                GetHandreUpper(ivalue,svalue);
        }
        else if(ivalue == 10000)
        {
                GetUpperFromLower(1,svalue);
                strcat(svalue, "万");
        }
        else if((ivalue > 10000)&&( ivalue < 100000000))
        {
                GetThousandUpper(ivalue,svalue);
        }
        else if(ivalue == 100000000)
        {
                GetUpperFromLower(1,svalue);
                strcat(svalue, "亿");
        }
        else if((ivalue > 100000000)&&(ivalue <= 2000000000))
        {
                GetAllUpper(ivalue,svalue);
        }
        else 
                return false;
        return true;