9 条题解
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7
#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'*': cout<<x*y; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; } -
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rc2025guoyanshan LV 7 @ 2025-3-23 9:39:06
#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'': cout<<xy; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; }
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rc247lijunhe1 LV 8 @ 2024-3-4 19:38:22
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#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'*': cout<<x*y; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; } -
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rc245zhangjiayi1 LV 6 @ 1 天前
#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'': cout<<xy; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; }
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rc247chenbosheng1 LV 8 @ 3 天前
#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'*': cout<<x*y; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; }
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#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'*': cout<<x*y; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; } -
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#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'': cout<<xy; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; }
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#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'': cout<<xy; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; }
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rc245zhangxiaoyu1 LV 8 @ 2024-3-9 21:10:46
#include <bits/stdc++.h> using namespace std; int main() { int a,b,c; char d; cin>>a>>b>>d; if(d!='+'&&d!='-'&&d!=''&&d!='/') { cout<<"Invalid operator!";} else { if(d=='+') { c=a+b;} else if(d=='-') { c=a-b; } else if(d=='') { c=a*b; } else if(d=='/') { if(b==0) { cout<<"Divided by zero!"; exit(0); } else { c=a/b; } } else {
} } cout<<c; return 0;}
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rc245zhangjiayi1 LV 5 @ 2024-3-3 10:40:55
#include<bits/stdc++.h> #define int long long #define endl '\n' using namespace std; int a[10000]; string s1,s2,s3,s4; signed main(){ int x,y; char f; cin>>x>>y>>f; switch(f){ case'+': cout<<x+y; break; case'-': cout<<x-y; break; case'': cout<<xy; break; case'/': if(y==0){ cout<<"Divided by zero!"; } else{ cout<<x/y; } break; default : cout<<"Invalid operator!"; } return 0; }
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rc246zhangmogeni1
LV 7
@ 2024-2-23 16:28:55
叠甲：c风格处理速度比c++风格处理速度快，但两者皆可通过c++测试，请谅解！！！
首先，我们先排除计算器的常见问题：
#include<bits/stdc++.h> using namespace std; int main(){ int a,b; char c; cin>>a>>b>>c; if(c!='+'&&c!='-'&&c!='*'&&c!='/') { cout<<"Invalid operator!"; return 0;//return 0指系统返回值，不再执行下个语句 } if(c=='/'&&b==0) { cout<<"Divided by zero!"; return 0; }这样，我们就可以排除符号写错、除数为0的问题。
符号写错是+、-、*、/以外的符号写入，从而导致的错误；
除数为0是一个DDDD（懂的都懂）的问题，不再多提。
其次，再加入算法，运行
if(c=='+') cout<<a+b; if(c=='-') cout<<a-b; if(c=='*') cout<<a*b; if(c=='/') cout<<a/b; }总结：此题难点在于一些错误输出的应对方法，但对算法没有过多要求，总体来说还是比较简单的。
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rc246fengxiang1
@ 2024-2-29 20:35:04
你的代码的确有问题，或者说是可以改进的地方： 1.头文件？ 2.为什么不用scanf和printf而用cin和cout？scanf和printf的编译时间比cin和cout短，很好的规避了很多编译超时 3.同样是时间的问题，if else结构复杂，行数多，繁琐，我们可以用swich语句来解决：
swich(){ cace' ':cout<<;break; cace' ':cout<<;break; cace' ':cout<<;break; cace' ':cout<<;break; default:cout<<;break; ｝只需要在判断除法的时候判断是否为0就行了：
if(y==0) cout<<"Divided by zero!"; else cout<</;编译时间长，着我没骗你，我用DEV做了个实验： 你的代码：
我的代码：
只不过这道题比较简单，还不太可能出现编译超时，不过做到复杂的算法题就得小心了。下面分享一下我的代码：
#include<stdio.h> int main() { int a,b; char c; scanf("%d %d %c",&a,&b,&c); if (b==0) printf("Divided by zero!"); else switch(c) { case '+':printf("%d",a+b);break; case '-':printf("%d",a-b);break; case '*':printf("%d",a*b);break; case '/': if (b==0) printf("Divided by zero!"); else printf("%d",a/b); break; default:printf("Invalid operator!"); } return 0; } -
rc246fengxiang1
@ 2024-2-29 20:37:35
我们的代码时差就2秒，现实中是很短的，不过在计算机里可是“谬以千秒”
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rc246zhangmogeni1
@ 2024-3-5 20:54:20
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rc246zhangmogeni1
@ 2024-3-5 21:10:15
谅解一下，头文件因未压在代码块中导致显示不出来，现已改正
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