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µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû

fengfeng×Ó

Òø³æ (ÕýʽдÊÖ)

[ÇóÖú] ³õѧÕߣ¬C++¾À´í ÒÑÓÐ2È˲ÎÓë

//Õâ¸öÊǼ¸¸öÊýÏà¼ÓµÃС´úÂ룬×îºó×ÜÊǽá¹ûÊä²»³öÀ´£¬Âé·³ÄÄλ´óÉñ°ïæ¿´Ò»ÏÂ
//¶à¸öÊý×ֵļӼõ³Ë³ý
#include<iostream>
#include<conio.h>
#include<stdio.h>
using namespace std;

int main()
{
        int num1=0;
        int num2;
        char ap;
        cout<<"Expression:";
        cin>>num1;
         if(!cin)exit(0);  //Èç¹ûÊäÈëµÄÀàÐͲ»Ò»Ö¾ʹíÎó
while(cin>>ap)
{
        if(ap!=';')cin>>num2;
        if(!cin)exit(0);
        switch(ap)
        {
        case'+':
                num1+=num2;
                break;
        case'-':
                num1-=num2;
                break;
        case'*':
                num1*=num2;
                break;
        case'/':
                num1/=num2;
                break;
        default:
        cout<<"error.\n";
        }
}
cout<<"result:"<<num1<<"\n";
getch();
return 0;
}
»Ø¸´´ËÂ¥
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

YouthUtopian

ÖÁ×ðľ³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
3Â¥: Originally posted by fengfeng×Ó at 2015-08-05 17:29:55
ÎÒÒ²¾õµÃÊÇ£¬µ«ÊDz»ÖªµÀÔõô¸Ä...

#include<iostream>
#include<conio.h>
#include<stdio.h>
using namespace std;

int main()
{
        int num1=0;
        int num2;
        char ap;
        cout<<"Expression:";
        cin>>num1;
        if(!cin)exit(0);  //Èç¹ûÊäÈëµÄÀàÐͲ»Ò»Ö¾ʹíÎó

        while(cin>>ap)
        {
                if(ap!=';')cin>>num2;
                else break;
                if(!cin)exit(0);
                switch(ap)
                {
                case'+':
                        num1+=num2;
                        break;
                case'-':
                        num1-=num2;
                        break;
                case'*':
                        num1*=num2;
                        break;
                case'/':
                        num1/=num2;
                        break;
                default:
                        cout<<"error.\n";
                }
        }
        cout<<"result:"<<num1<<"\n";
        getch();
        return 0;
}
ÊäÈëÍêÖ®ºó°´ ·ÖºÅ£¨Ó¢ÎÄÊäÈ뷨ϵģ©Í˳ö
7Â¥2015-08-05 18:52:24
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 16 ¸ö»Ø´ð

YouthUtopian

ÖÁ×ðľ³æ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
fengfeng×Ó: ½ð±Ò+10, ¡ïÓаïÖú 2015-08-05 17:31:37
while(cin>>ap) ÓÐÎÊÌ⣬Õâ¸öwhileÑ­»·ÊǸöËÀÑ­»·£¬³ö²»À´¡£
2Â¥2015-08-05 16:51:46
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

fengfeng×Ó

Òø³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by YouthUtopian at 2015-08-05 16:51:46
while(cin>>ap) ÓÐÎÊÌ⣬Õâ¸öwhileÑ­»·ÊǸöËÀÑ­»·£¬³ö²»À´¡£

ÎÒÒ²¾õµÃÊÇ£¬µ«ÊDz»ÖªµÀÔõô¸Ä
3Â¥2015-08-05 17:29:55
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

alexisalex

Ìú³æ (³õÈëÎÄ̳)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¿ÉÒÔͨ¹ý´úÂ룬´ó¸ÅÖªµÀÄãµÄÒâ˼¡£¾ÍÊÇÊäÈëÒ»¸ö³¤µÄ¼ÆËã×Ö·û´®£¬ÀàÈ磺¡°3+2x4-2= "ÕâÑùµÄ×Ö·û´®È»ºóÊä³ö½á¹û¶Ô°É£¡

Äã˵µÄ²»³ö½á¹ûÓ¦¸ÃÊÇÒòΪÄãÔÚ¡±=¡°µÄºóÃæÃ»Óмӿոñ°É£¬×¢ÒâÄãµÄ´úÂëµÄÕâÒ»¾ä
if(!cin)exit(0);  // Èç¹ûcinΪnull¾ÍÍ˳ö

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