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详细对一般字符串表达式解析

            rear1=0;<BR>&nbsp; front2=0;<BR>&nbsp; rear2=0;<BR>}</P>
            <P>void pop()&nbsp; //显示结果<BR>{<BR>&nbsp;float QFront(float 
            num1,float num2,char *temp);<BR>&nbsp;float 
            num1,num2;<BR>&nbsp;float sum;<BR>&nbsp;char 
            temp;<BR>&nbsp;temp=qlist[front];&nbsp; 
            //将第一个队列中的头结点读出来<BR>&nbsp;while(count1!=0)&nbsp;&nbsp;&nbsp; 
            //判断第二个队列是否有数<BR>&nbsp;{<BR>&nbsp;temp=qlist[front];&nbsp; 
            //将队列中头结点读出来<BR>&nbsp;sum=QFront(num1,num2,&amp;temp);<BR>&nbsp;count--;<BR>&nbsp;front=(front+1)%MaxQSize;//将第一个队列头指针加1<BR>&nbsp; 
            }<BR>&nbsp;&nbsp; if(count!=0 &amp;&amp; 
            temp=='s')&nbsp;&nbsp;&nbsp; <BR>&nbsp;&nbsp;&nbsp; 
            sum=sqrt(qlist2[front2]);<BR>&nbsp; if(count!=0 &amp;&amp; 
            temp=='n')<BR>&nbsp;&nbsp;&nbsp; sum=sin(qlist2[front2]);<BR>&nbsp; 
            if(count!=0 &amp;&amp; temp=='o')<BR>&nbsp;&nbsp;&nbsp; 
            sum=cos(qlist2[front2]);<BR>&nbsp;printf("%f",sum);<BR>}</P>
            <P>float QFront(float num1,float num2,char 
            *temp)<BR>{<BR>&nbsp;float number,numb1;<BR>&nbsp;float 
            QFront1();<BR>&nbsp;void 
            QInsert(float);<BR>&nbsp;num1=QFront1();&nbsp; 
            //先读出一个数<BR>&nbsp;switch(*temp)<BR>&nbsp;{<BR>&nbsp; case 
            '+':<BR>&nbsp;&nbsp; if(count2==0)<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            num2=QFront1();//读出第二个数<BR>&nbsp;&nbsp; 
            number=num1+num2;<BR>&nbsp;&nbsp;&nbsp; 
            QInsert(number);//将结果存入第三个队列<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            number=num1+qlist2[front2];<BR>&nbsp;&nbsp; 
            front2=(front2+1)%MaxQSize;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; break;</P>
            <P>&nbsp; case '-':<BR>&nbsp;&nbsp; if(count2==0)<BR>&nbsp;&nbsp; 
            {<BR>&nbsp;&nbsp; num2=QFront1();<BR>&nbsp;&nbsp; 
            number=num1-num2;<BR>&nbsp;&nbsp; 
            printf("number=%f\n",number);<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            number=qlist2[front2]-num1;<BR>&nbsp;&nbsp; 
            printf("number=%f\n",number);<BR>&nbsp;&nbsp; 
            front2=(front2+1)%MaxQSize;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; break;</P>
            <P>&nbsp;&nbsp; case '*':<BR>&nbsp;&nbsp; if(count2==0) 
            //如果第三个队列中没有数据，则从第二个队列中读出一个数据<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            num2=QFront1();<BR>&nbsp;&nbsp; number=num1*num2;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; else 
            //否则，从第三个队列中读出数据<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            number=qlist2[front2]*num1;<BR>&nbsp;&nbsp; 
            front2=(front2+1)%MaxQSize;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            break;<BR>&nbsp;&nbsp; case '/':<BR>&nbsp;&nbsp;&nbsp;&nbsp; 
            if(count2==0)<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            num2=QFront1();<BR>&nbsp;&nbsp; if(num2==0)<BR>&nbsp;&nbsp; 
            {<BR>&nbsp;&nbsp;&nbsp; printf("divied by 0");<BR>&nbsp;&nbsp;&nbsp; 
            ClearStack();<BR>&nbsp;&nbsp;&nbsp; exit(1);<BR>&nbsp;&nbsp; 
            }<BR>&nbsp;&nbsp; else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            number=num1/num2;<BR>&nbsp;&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp;&nbsp; 
            }<BR>&nbsp;&nbsp; else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            if(num1==0)<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp;&nbsp;&nbsp; 
            printf("divide by 0");<BR>&nbsp;&nbsp;&nbsp;&nbsp; 
            ClearStack();<BR>&nbsp;&nbsp;&nbsp;&nbsp; exit(1);<BR>&nbsp;&nbsp; 
            }<BR>&nbsp;&nbsp; else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            number=qlist2[front2]/num1;<BR>&nbsp;&nbsp;&nbsp; 
            front2=(front2+1)%MaxQSize;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp;&nbsp; 
            }<BR>&nbsp;&nbsp; break;</P>
            <P>&nbsp;&nbsp; case 's':<BR>&nbsp;&nbsp;&nbsp;&nbsp; 
            if(count2==0)<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp;&nbsp; 
            number=sqrt(num1);<BR>&nbsp;&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp;&nbsp; 
            number=sqrt(qlist2[front2]);<BR>&nbsp;&nbsp; 
            printf("number=%d\n",number);<BR>&nbsp;&nbsp; 
            front2=(front2+1)%MaxQSize;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            break;<BR>&nbsp; case 'n':<BR>&nbsp; if(count2==0)<BR>&nbsp;&nbsp; 
            {<BR>&nbsp;&nbsp;&nbsp; number=sin(num1);<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            number=sin(qlist2[front2]);<BR>&nbsp;&nbsp; 
            front2=(front2+1)%MaxQSize;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; break;</P>
            <P>&nbsp;&nbsp; case 'o':<BR>&nbsp;&nbsp;&nbsp;&nbsp; 
            if(count2==0)<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp;&nbsp; 
            number=cos(num1);<BR>&nbsp;&nbsp; 
            printf("number=%d\n",number);<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            else<BR>&nbsp;&nbsp; {<BR>&nbsp;&nbsp; 
            number=cos(qlist2[front2]);<BR>&nbsp;&nbsp; 
            printf("number=%d\n",number);<BR>&nbsp;&nbsp; 
            front2=(front2+1)%MaxQSize;<BR>&nbsp;&nbsp; 
            QInsert(number);<BR>&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp; 
            break;<BR>&nbsp;}<BR>&nbsp;return number;<BR>&nbsp;}</P>
            <P>float QFront1() //从第一个数据读数据<BR>{<BR>&nbsp; float temp;<BR>&nbsp; 
            if(count1==0)<BR>&nbsp; {<BR>&nbsp;&nbsp; printf("Deleting from an 
            empty queue!\n");<BR>&nbsp;&nbsp; exit(1);<BR>&nbsp;&nbsp; 
            }<BR>&nbsp;&nbsp; temp=qlist1[front1];<BR>&nbsp;&nbsp; 
            count1--;<BR>&nbsp;&nbsp; 
            front1=(front1+1)%MaxQSize;<BR>&nbsp;&nbsp; return temp;<BR>&nbsp; 
            }</P>
            <P>void QInsert(float number)&nbsp; 
            //将结果存入第三个队列<BR>{<BR>&nbsp;if(count2==MaxQSize)<BR>&nbsp;{<BR>&nbsp;&nbsp; 
            printf("Queue overflow!\n");<BR>&nbsp;&nbsp; exit(1);<BR>&nbsp; 
            }<BR>&nbsp; count2++;<BR>&nbsp; qlist2[rear2]=number;<BR>&nbsp; 
            rear2=(rear2+1)%MaxQSize;<BR>&nbsp;&nbsp; }</P>
            <P>其实这个程序用链表实现更好，但是由于时间关系，所以用了数组。当然，这个程序还不是很完善，还有很多地方需要改进，比如可以用图形界面来进行操作、可以将三个队列放入一个结构体中等。看了这个程序后，如果你有什么高见，请与我联系，QQ：150543976（注意：请说出我加你理由）</P></TD>
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          <TD class=normal_f vAlign=bottom width=547>出处： 
            C语言之家&nbsp;&nbsp;&nbsp;&nbsp;日期：2005-09-19 
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