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#include<stdio.h> #define MAX 20 main() {     int i=0,j=0,k,l,m,n,number;     char ch;     char a[MAX][MAX];     printf("请输入正规式：");     ch=getchar();     while(ch!='\n')     {         if(ch=='/')         {             a[i][j]='\0';             j=0;             i++;             ch=getchar();             continue;         }         a[i][j]=ch;         j++;         ch=getchar();     }     a[i][j]='\0';       number=2;     for(k=0;k<=i;k++)     {         l=0;         m=1;         while(a[k][l]!='\0')         {             if(a[k][l]=='.'||a[k][l]=='*')             {                  if(a[k][l]=='.'&&m==1)                {                  m++;                  printf("f(0,%c)=%d\n",a[k][l-1],number);                  if(a[k][l+2]=='\0')                   printf("f(%d,%c)=1\n",number,a[k][l+1]);                  number=number+1;                }                  else if(a[k][l]=='.'&&m!=1)                {                    m++;                    printf("f(%d,%c)=%d\n",number-1,a[k][l-1],number);                    if(a[k][l+2]=='\0')                     printf("f(%d,%c)=1\n",number,a[k][l+1]);                     number=number+1;                }                  else if(a[k][l]=='*'&&m==1)                {                    m++;                    printf("f(0,~)=%d\n",number);                    printf("f(%d,%c)=%d\n",number,a[k][l-1],number);                    if(a[k][l+1]=='\0')                     printf("f(%d,~)=1\n",number);                    else                     printf("f(%d,~)=%d\n",number,number+1);                    number=number+1;                }                  else if(a[k][l]=='*'&&m!=1)                {                     m++;                    printf("f(%d,%c)=%d\n",number,a[k][l-1],number);                    if(a[k][l+1]=='\0')                     printf("f(%d,~)=1\n",number);                    else                     printf("f(%d,~)=%d\n",number,number+1);                    number=number+1;                }             }             l++;         }     }     }