#include<stdio.h>
#include<string.h>

void s_fun(int a)
{
    int k;
    k=a;
  switch(k)
  {
       case 1:
           printf("一");break;
       case 2:
           printf("二");break;
       case 3:
           printf("三");break;
       case 4:
           printf("四");break;
       case 5:
           printf("五");break;
       case 6:
           printf("六");break;
       case 7:
           printf("七");break;
       case 8:
           printf("八");break;
       case 9:
           printf("九");break;
  }
  
}

void k_fun(int b)
{
    int t=b;
   switch(t)
  {
      case 1:
          printf("十");break;
      case 2:
          printf("百");break;
      case 3:
          printf("千");break;
      case 4:
          printf("万");break;
      case 5:
          printf("十");break;
      case 6:
          printf("百");break;
      case 7:
          printf("千");break;
      case 8:
          printf("亿");break;
      default:
          break;
  }
}

int main()
{
    int m,s,flag=0;
    char buf[20];
    printf("Please input integer:\n");
    scanf("%d",&m);
     while( m > 0 )
     {
        s=m%10;
        buf[flag]=s;
        m/=10;
        flag++;
     }
     while( flag-- >= 0 )
     {
         s_fun(buf[flag]);
         k_fun(flag);
     }
    return 0
}

再修改下，把某位是0的时候考虑进去就ok了

#include<stdio.h>
#include<string.h>

void s_fun(int a)
{
    int k;
    k=a;
  switch(k)
  {
       case 1:
           printf("一");break;
       case 2:
           printf("二");break;
       case 3:
           printf("三");break;
       case 4:
           printf("四");break;
       case 5:
           printf("五");break;
       case 6:
           printf("六");break;
       case 7:
           printf("七");break;
       case 8:
           printf("八");break;
       case 9:
           printf("九");break;
       default:
           break;
  }
  
}

void k_fun(int b,char *buf)
{
    int t=b;
    switch(t)
    {   
       case 8:                                                         
           if(buf[8] == 0)
               ;
           else
               printf("亿");break;
       case 7:
           if( buf[7] == 0 )
               if( buf[6] == 0)
                   ;
               else
                   printf("零");
               else
                   printf("千");break;
       case 6:
           if( buf[6] == 0 && buf[7] == 0 )
               if( buf[5] == 0 )
                   ;
               else
                   printf("零");
               else if( buf[6] == 0 && buf[7] != 0 )
                   printf("零");        
               else if( buf[6] != 0 && buf[7] != 0)
                   printf("百");
               else if( buf[6] != 0 && buf[7] == 0 )
                   printf("百");break;
       case 5:
           if( buf[5] == 0 && buf[6] == 0 && buf[7] == 0 )
               if( buf[4] == 0)
                   ;
               else
                   printf("零");
           else if( buf[5] == 0 && buf[6] != 0 && buf[7] != 0 )
                   if( buf[4] == 0)   
                       ;
                   else
                       printf("零");   
           else if( buf[5] == 0 && buf[6] == 0 && buf[7] != 0 )
                   if( buf[4] == 0 )
                       ;
                   else
                       printf("零");
           else if( buf[5] != 0 && buf[6] == 0 && buf[7] != 0 )                                                                                
                  ;
           else if( buf[5] != 0 && buf[6] != 0 && buf[7] == 0 )
                  printf("十");                                                                                    
           else if( buf[5] == 0 && buf[6] != 0 && buf[7] == 0 )
               if( buf[4] == 0 )
                   ;               
               else
                   printf("零");   
           else if( buf[5] != 0 && buf[6] == 0 && buf[7] == 0 )            
               printf("十");
           else if( buf[5] != 0 && buf[6] != 0 && buf[7] != 0 )
               printf("十");
           else
               ;break;
       case 4:
           if( buf[4] == 0 && buf[5] == 0 && buf[6] == 0 && buf[7] == 0 )
               ;
           else if( (buf[4] != 0 || buf[5] != 0 || buf[6] != 0 || buf[7] != 0) == 1 )
               printf("万");break;
       case 3:
           if( buf[3] == 0 )
               if( buf[2] == 0 )
                   ;
               else
                   printf("零");
           else
               printf("千");break;
       case 2:
           if( buf[2] == 0 && buf[3] == 0 )
               if( buf[1] == 0 )
                   ;
               else
                   printf("零");
           else if( buf[2] == 0 && buf[3] != 0 )
               printf("零");        
           else if( buf[2] != 0 && buf[3] != 0 )
               printf("百");
           else if( buf[2] != 0 && buf[3] == 0 )
               printf("百");break;   
       case 1:
           if( buf[1] == 0 && buf[2] == 0 && buf[3] == 0 )
               if( buf[0] == 0)
                   ;
               else
                   printf("零");
           else if( buf[1] == 0 && buf[2] != 0 && buf[3] != 0 )            
                   if( buf[0] == 0)
                       ;
                   else
                       printf("零");
           else if( buf[1] == 0 && buf[2] == 0 && buf[3] != 0 )
               if( buf[0] == 0)
                   ;
               else
                   printf("零");
               else if( buf[1] != 0 && buf[2] == 0 && buf[3] != 0 )
                   ;
               else if( buf[1] != 0 && buf[2] != 0 && buf[3] == 0 )
                   printf("十");
               else if( buf[1] == 0 && buf[2] != 0 && buf[3] == 0 )
                   if( buf[0] == 0)
                       ;
                   else
                       printf("零");
               else if( buf[1] != 0 && buf[2] == 0 && buf[3] == 0 )      
                   printf("十");
               else if( buf[1] != 0 && buf[2] != 0 && buf[3] != 0 )
                   printf("十");
               else
                   ;break;
       default:
           break;
     }
}
                        
         

int main()
{
    int m,s,flag=0;
    char buf[21];
    printf("Please input integer:\n");
    scanf("%d",&m);
     while( m > 0 )
     {
        s=m%10;
        buf[flag]=s;
           m/=10;
        flag++;
     }
                                                                        
     while(flag-- >= 0)
     {
         s_fun(buf[flag]);
         k_fun(flag,buf);
     }
}

呵呵呵

不错！