#include <stdio.h>
#include <stdlib.h>
void printf_lxheshu(char lx,char shu);
void zhuanhuanhanshu_i(int lxz,long zhuanhuan,long zhuanhuanhou);
void zhuanhuanhanshu_f(int lxz,long zhuanhuan,long zhuanhuanhou);
void yichu_i(long zhuanhuan,long zhuanhuanhou);
void yichu_f(long double zhuanhuan,long double zhuanhuanhou);
int main (void)
{
unsigned char lx[40],shu[40];
    int lxz;
    printf("请输入你要求的类型(有short,int,long,float,double,longdouble):\n");
    scanf("%s",lx);
   printf("请输入你要求的数\n");
        scanf("%s",shu);
    printf("您输入的数的类型是%s,",lx);
    printf("您输入的数是%s,",shu);
lxz =(int)lx[0]+(int)lx[1]+(int)lx[2]+(int)lx[3]+(int)lx[4]+(int)lx[5];
if(atof(shu)!=atol(shu))
{  
    long double zhuanhuan,zhuanhuanhou;
    zhuanhuan = atof(shu);
  zhuanhuanhanshu_f(lxz,zhuanhuan,zhuanhuanhou);

 
   yichu_f(zhuanhuan,zhuanhuanhou);
    
}


if(atof(shu)==atol(shu))
{    
    long zhuanhuan,zhuanhuanhou;
    zhuanhuan = atol(shu); 
zhuanhuanhanshu_i(lxz,zhuanhuan,zhuanhuanhou);

     yichu_i(zhuanhuan,zhuanhuanhou);
      
}

}




void zhuanhuanhanshu_i(int lxz,long zhuanhuan ,long zhuanhuanhou)
{
    if (lxz==560)
   zhuanhuanhou=(short)zhuanhuan;
     if (lxz==739)
   zhuanhuanhou=(int)zhuanhuan;
        if (lxz==651)
    zhuanhuanhou=(long)zhuanhuan;
}


void zhuanhuanhanshu_f(int lxz,long zhuanhuan, long zhuanhuanhou)
{    if (lxz==643)

 zhuanhuanhou=(long double)zhuanhuan;
    if (lxz==635)
zhuanhuanhou=(double)zhuanhuan;
if (lxz==534)
zhuanhuanhou=(float)zhuanhuan;

}

void yichu_i(long zhuanhuan,long zhuanhuanhou)
{   
  if(zhuanhuan==zhuanhuanhou)
      printf("未溢出");
  if(zhuanhuan!=zhuanhuanhou)
     printf("溢出，转换后的数为%d",zhuanhuanhou);
}


 void yichu_f(long double zhuanhuan,long double zhuanhuanhou)
{   
  if( zhuanhuan==zhuanhuanhou)
      printf("未溢出");
  if (zhuanhuan!=zhuanhuanhou)
      printf("溢出,得到数为%f",zhuanhuanhou);

 }

 zhuanhuanhou=(short)zhuanhuan;
     if (lxz==739)
printf("%d",zhuanhuanhou);
   zhuanhuanhou=(int)zhuanhuan;
        if (lxz==651)
    zhuanhuanhou=(long)zhuanhuan;  在这里加printf函数，显示 zhuanhuanhou 的值为3，是正常的

    long zhuanhuan,zhuanhuanhou;
    zhuanhuan = atol(shu);
zhuanhuanhanshu_i(lxz,zhuanhuan,zhuanhuanhou);
 printf("%d",zhuanhuanhou);
     yichu_i(zhuanhuan,zhuanhuanhou);      在这里加printf函数就变成-858993460

我实在是想不通为什么在自定义的函数里 是对的，一出来就错了呢，郁闷死了，求大神教我啊~~~~~~~~~~~~~~~
30分啊~~~我的全部积蓄了，来人拿啊

[ 本帖最后由 hutianlun 于 2013-7-13 03:49 编辑 ]

建议你先用vs2012这个软件来调试一下，因为在代码窗口，如果你的代码出现了一些明显错误，它会以波浪线的形式提示你的

眼好花 ，全部都是zhuanhuan**

函数都是值传递  主函数中的zhuanhuan  zhanhuanhou  变量的值都没变   改成指针传递运行下吧

实参将值赋给形参，单形参不会改变实参的值。
也就是说你转换类型函数里面的值并不会影响主函数的值，
改成指针类型，直接对地址里面的值进行更改就行