#include<stdio.h>
#include<string.h>
char prog[80],token[8];
char ch;
int syn,p,m,n,sum,e;
char * rwtab[6]={"function","if","then","while","do","endfunc"};
scaner();
main()
{
    p=0;
    printf("\n please input string:\n");
    do{
        scanf("%c",&ch);
        prog[++p]=ch;
    }
    while(ch!='#');
    p=0;
    do
    {
        scaner();
        switch(syn)
        {
       case 11:printf("\n(%d,%d)",syn,sum);
       break;
        case-1:printf("\n erron");
            break;
        default:printf("\n(%d,%s)",syn,token);
        }
    }
    while(syn!=0);
    return 0;
}
scaner()
{
    for(n=0;n<8;n++)token[n]=NULL;
    ch=prog[++p];
    while(ch!='#')ch=prog[++p];
        if(ch>='a'&&ch<='z')
        {
            m=0;
            while(ch>='a'&&ch<='z'||ch>='0'&&ch<='9')
            {
                token[m++]=ch;
                ch=prog[++p];
            }
            token[m]='\0';
            ch=prog[--p];
            syn=10;
            for(n=0;n<6;n++)
                if(strcmp(token,rwtab[n])==0)
                {
                    syn=n+1;
                    break;
                }
            }
            else
                if(ch>='0'&&ch<='9')
                {
                    sum=0;
                    while(ch>='0'&&ch<='9')
                    {
                        sum=sum*10+ch-'0';
                        ch=prog[++p];
                    }
                    ch=prog[--p];
                    syn=11;
                }
                if(ch=='.')   //有小数点
                {
                 e=-1;
                 ch=prog[p++];
                 if(ch>='0'&&ch<='9')
                 {
                   while(ch>='0'&&ch<='9')
                   {
                       sum=sum+(ch-'0')*pow(10,e--);
                       ch=prog[p++];
                   }
                 }
                }
                else
                    switch(ch)
                {
                    case'<':m=0;
                        token[m++]=ch;
                        ch=prog[++p];
                        if(ch=='=')
                        {
                            syn=22;
                            token[m+1]=ch;
                        }
                        else
                        {
                            syn=20;ch=prog[--p];
                        }
                        break;
                    case'>':m=0;token[m++]=ch;
                        ch=prog[++p];
                        if(ch=='=')
                        {
                            syn=24;
                            token[m++]=ch;
                        }
                        else
                        {
                            syn=23;
                            ch=prog[--p];
                        }
                        break;
   
                    case'=':m=0;
                        token[m++]=ch;
                        ch=prog[++p];
                        if(ch=='=')
                        {
                            syn=25;
                            token[m++]=ch;
                        }
                        else
                        {
                            syn=18;
                            ch=prog[--p];
                        }
                        break;
                    case'!':m=0;token[m++]=ch;
                        ch=prog[++p];
                        if(ch=='=')
                        {
                            syn=22;token[m++]=ch;
                        }
                        else
                            syn=-1;
                        break;
                    case'+':syn=13;token[0]=ch;break;
                    case'-':syn=14;token[0]=ch;break;
                    case'*':syn=15;token[0]=ch;break;
                    case'/':syn=16;token[0]=ch;break;
                    case';':syn=26;token[0]=ch;break;
                    case'(':syn=27;token[0]=ch;break;
                    case')':syn=28;token[0]=ch;break;
                    case'#':syn=0;token[0]=ch;break;
                    default:syn=-1;
                }
                return 0;
}

————————————————————————————————————————
这个代码我们老师要求改成能够识别小数和实数的科学计数部分 大于1位的整数不能以0开头 且诸如1.或.1的形式是错误的 请问我该怎么改这个代码啊 求教大神讲解一下 万分感谢

你这个程序本来的功能是怎样的，能举例不

本来的功能就是就是输入了数字之后，它会输出你输入的数字和相应的syn  现在就是要在这基础上改一下 最后能实现输入任意字符串 能够识别里面的小数或者实数

能不能帮帮忙 实在没办法了 教教我也好啊 万分感谢

关键是看不懂你这程序到底实现了什么功能，你需要实现什么。让你举个例子也没有。

就是 本来的程序功能是这样的 实验一 这个就是个例子
 但是现在要求是要修改代码使它最后能在输入的字符串中识别实数或者小数的科学技术部分中 大于1位的整数不能以0开头 而且类似1. 或 .1这样的形式是错误的

最后比如输入这种字符串 要能识别实数或者小数的科学技术部分中 大于1位的整数不能以0开头 而且类似1. 或 .1这样的形式是错误的