2021-11-12

将一个数组中的特定字符复制到另一个数组中去
如a数组中的ecjcv3884ce646bf变成b数组3884646

#include "stdio.h"
#include  "string.h"
int main() 
{    
char a[100], b[100];
memset(a, 0, sizeof(a));
memset(b, 0, sizeof(b));
printf("please input a string:\n>> "); 

scanf("%s", a);    
int b_idx = 0;    
for (int i = 0; i < sizeof(a); i++) 
{        
    if ('0' <= a[i] && a[i] <= '9') 
    {            
          b[b_idx] = a[i];            
          b_idx += 1;        
     }    
}    
          printf("%s", b);    
          return 0;
}