• 字符串


    Queue DeleteQ(Queue Q)//出队列
    {
    int i=t++;
    QueueNode *p;
    char y=NULL;
    if(Q.front==Q.rear)
    {
    printf("队列为,无法出队列!");//判断队列是否为空
    return(Q);
    }
    p=Q.front->next;
    y=Q.front->next->data;//将队列中的元素赋值给y
    Q.front->next=p->next;
    if(p==Q.rear)
    Q.rear=Q.front;
    if((y>='A'&&y<='Z')||(y>='a'&&y<='z'))//利用ASCII判断y是否是属于字母,并存储在数组str中
    str[i]=y;
    else
    {
    if(str[0]!=NULL)//如果数组str非空,则输出
    Print(str);
    t=0;
    if(y=='+'||y=='-'||y=='*'||y=='/'||y==':'||y=='<'||y=='>')//判断字符是否是运算符
    {
    if(p->next->data=='=')//判断运算是否是由两个字符组成
    {
    printf("(运算符,%c%c) ",y,p->next->data);
    Q.front->next=p->next->next;
    free(p->next);
    }
    else
    printf("(运算符,%c) ",y);
    }
    else if(y=='=')//判断字符是否是运算符
    printf("(运算符,%c) ",y);
    else if(y>=48&&y<=57)//判断字符是否为数字
    {
    st[t1]=y;//将字符数字赋值给数组st
    t1++;
    if(p->next->data<48||p->next->data>57)//判断队列中下一个字符是否为数字,如果是非字符数字,则输出数组st
    if(st[0]!='o')
    printf("(常数,%s) ",st);
    }
    else if(y==33||y==34||(y>=39&&y<=41)||y==44||y==46||y==58||y==59||(y>=91&&y<=96)||(y>=123&&y<=125))//判断是否为界符
    printf("(界符,%c) ",y);
    else if(y==' ')
    printf("(空格符,%c) ",y);//判断空格符
    else
    printf("(特殊符号,%c) ",y);//其他的当作特殊符号处理
    }
    free(p);
    return Q;
    }
    int main()
    {
    char x,y;
    Queue p,q;
    p=InitQueue();
    printf("请输入你想输入字符串: ");
    while(scanf("%c",&x)==1&&x!=' ')//大神的方法,牛
    p=InserQ(p,x);
    q=p;
    while(p.front!=p.rear)
    p=DeleteQ(p);
    if(str[0]!='o')//判断数组str是否为空
    Print(str);
    }
    void Print(char str[])//调用函数来判断关键字与标识符
    {

    int i=0;
    if(strcmp(str,"break")==0||strcmp(str,"case")==0||strcmp(str,"char")==0||strcmp(str,"const")==0||strcmp(str,"continue")==0||strcmp(str,"default")==0||strcmp(str,"do")==0||strcmp(str,"double")==0||strcmp(str,"else")==0||strcmp(str,"enum")==0||strcmp(str,"extern")==0||strcmp(str,"float")==0||strcmp(str,"for")==0||strcmp(str,"goto")==0||strcmp(str,"if")==0||strcmp(str,"int")==0||strcmp(str,"long")==0||strcmp(str,"register")==0||strcmp(str,"return")==0||strcmp(str,"short")==0||strcmp(str,"signed")==0||strcmp(str,"sizeof")==0||strcmp(str,"static")==0||strcmp(str,"struct")==0||strcmp(str,"switch")==0||strcmp(str,"typedef")==0||strcmp(str,"unsigned")==0||strcmp(str,"union")==0||strcmp(str,"void")==0||strcmp(str,"volatile")==0||strcmp(str,"while")==0||strcmp(str,"auto")==0)
    printf("(关键字,%s) ",str);
    else
    {
    if(str[0]=='')
    return;
    printf("(标识符,%s) ",str);
    }
    memset(str,0,N);//清空数组str里的所有元素
    }

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  • 原文地址:https://www.cnblogs.com/qq2647409627/p/5924741.html
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