数字和字符串之间的转换

1.数字到字符串

// charint.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
#include <stdio.h>


int _tmain(int argc, _TCHAR* argv[])
{
  int num = 12345;
  int j = 0, i = 0;

  printf("intnum  = %d\n", num);

  char temp[7], str[7];

  while (num)
  {
    temp[i] = num%10 + '0';
    i++;
    num = num/10;
  }
  temp[i] = 0;
  i = i - 1;
  //std::cout << "temp = " << temp << std::endl;
  printf("strtemp = %s\n", temp);

  // 反转字符串
  while(i >= 0)
  {
    str[j] = temp[i];
    j++;
    i--;
  }
  str[j] = 0;

  //std::cout << "String = " << str << std::endl;
  printf("string  = %s\n", str);

  return 0;
}

2.字符串到数字

// charint.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
#include <stdio.h>

int _tmain(int argc, _TCHAR* argv[])
{
  int num = 12345;
  int j = 0, i = 0, sum = 0;
  char temp[7] = {'1', '2', '3', '4', '5', '\0'}, str[7];
  printf("strtemp = %s\n", temp);

  while (temp[i])
  {
    sum = sum*10 + (temp[i] - '0');
    i++;
  }
  printf("intsum  = %d\n", sum);

  return 0;
}