使程序从文本中删除数字 [英] Make program to delete number from text

问题描述

i want to make program using pointer that delete all number from text, for example when the input from keyboard is "ab1c9" then the program result "abc" only. so i actually think about using the pointer and overwrite it using the word without number result but it didntesnt seem work :/ and im still confuse about when should i use * or not

 #include <stdio.h>
 #include <stdlib.h>

  void deldigit(char *str)
 { char *res = str;
 int count=0;
  while(*str!='\0')
  {
  if(*str>='1' && *str<='9')
     { count++;}
  else
     {*(str-count)=*str; /* want this *str after increment to    overwrite *(str-count) */
             }
       str++;}
    *(str - count)= '\0';
   printf("%s",res);
   }
  int main()
  { char str[100];

   printf("inset word");
    scanf("%s",&str);
       deldigit(str);
  return 0;
   }

我的尝试：

What I have tried:

i tried to make two pointers that point to the same start of the array, but basically to make result not overlap, first pointer function is where all digits were removed and looking for digit, while the second one showing the result? i still confuse about the purpose of second pointer. 
 and also is it possible to declare char *str[100] in main?

和

and

scanf("%s",&str);

我应该使用&或不是？

should i use & or not?

推荐答案

首先使用你的第二个指针：

Start by using your second pointer:

void deldigit(char *str)
   { 
   char *res = str;
   while(*str!='\0')
      {
      if(!(*str>='1' && *str<='9'))
         {
         *res++ = *str;
         }
      str++;
      }
   *res = '\0';
   }

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