1216

#include<stdio.h>
char curr;
char LL1[1000];
int N=-1;

void T();
void E();
void F();
void e();
void t();
void error();
void scaner();

void main()
{    char ch;
    int i=0;
    printf("请输入需要分析的curr语法：(以#结束)\n");
    do{
        scanf("%c",&ch);
        LL1[i] = ch;
        i++;
    }while(ch != '#');
    scaner();
    E();
    if(curr == '#')
        printf("成功！\n");
    else{
        printf("文法有误！！\n");
        error();
    }

}

void scaner(){   //用于读取源函数的下一个字符

    N++;
    if(LL1[N] == ' '){
        N++;
    }else{
        curr = LL1[N];
    }
}

void E(){
    T();
    e();
}
void T(){
    F();
    t();
}

void e(){
    if(curr == '+'){
        scaner();
        T();
        e();
    }
    else if(curr == '-'){
        scaner();
        T();
        e();
    }else if(LL1[N+1] == '#' || LL1[N+1] == '+' || LL1[N+1] == '/' || LL1[N+1] == '*' || LL1[N+1] == '-'){
        if(LL1[N] != '(' && LL1[N] != ')')
        error();
    }
}

void t(){
    if(curr == '*'){
        scaner();
        F();
        T();
    }else if(curr == '/'){
        scaner();
        F();
        T();
    }else if(LL1[N+1] == '#' || LL1[N+1] == '+' || LL1[N+1] == '/' || LL1[N+1] == '*' || LL1[N+1] == '-'){
        if(LL1[N] != '(' && LL1[N] != ')')
        error();
    }
}
//LIE ZHI HUA TI GONG TAI MA
void F(){
    if(curr == '('){
        scaner();
        E();
        if(curr == ')'){
            scaner();
//            printf("111111");
        }else{
            error();
        }
    }else{
        //判断是否是函数或者是数字
        //error();
        while(1){
            if(curr >= 'a' && curr<='z' || curr >= 'A' && curr <= 'Z' || curr >= '0' && curr <= '9'){
                scaner();
            }else{
                break;
            }
        }
    }
}

void error(){
    printf("%d %c之后的文法有错！\n",N,curr);
}