程序代码：

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

main()
{
    char ch[100];
    int n;

    printf("pls enter the number:\n");
    gets(ch);
    printf("pls enter the digit number you wanted to delete:\n");
    scanf("%d",&n);

    int i,j;
    int max,counter;
    for(i=0;i<n;i++)
    {
        max=i;
        for(j=0;ch[j]!='\0';j++)
            if(ch[max]<ch[j])
            max=j;
        ch[max]=' ';

    }
    i=0;
    while(1)
    {
        if(ch[i]>'0'&&ch[i]<='9')
        {
            counter=i;
            break;
        }
        i++;
    }
    for(i=counter;ch[i]!='\0';i++)
    {
        if(ch[i]!=' ')
            printf("%c",ch[i]);
    }

    return 0;
}