int matching(SqList L){
//判定顺序表L所保存算术表达式中括号是否匹配,若匹配则返回1,否则返回0
InitStack(S); //初始化辅助栈S
for (i=0;i
e=L.elem[i];
switch(e){
case ‘(':
case ‘[':
case ‘{': Push(S,e);break;
case ‘)': if (StackEmpty(S)) return ERROR; //右括号个数多于左括号
Pop(S,k);
if (k!=‘(') return ERROR; //括号嵌套错
break;
case ‘]': if (StackEmpty(S)) return ERROR;
Pop(S,k);
if (k!=‘[') return ERROR;
break;
case ‘}': if (StackEmpty(S)) return ERROR;
Pop (S,k);
if (k!=‘{') return ERROR;
}//switch
}//for
if (EmptyStack(S)) return OK; //括号匹配
else return ERROR; //左括号个数多于右括号
}//matching