PTA乙级题 1034. 有理数四则运算(20)

【题目链接】

这题还是直接上大佬代码吧，自己写的很乱。

#include<iostream> 
#include<cstdio> 
#include<cmath> 
using namespace std;  
int gcd(int a,int b){  
    return b==0?a:gcd(b,a%b);  
}  
void out(long long int a,long long int b){  
    long long int temp_a=a;  
    if(b<0) {b=-b;a=-a;temp_a=a;}  
    //cout<<a<<' '<<b<<' '; 
    long long int c=a/b;  
    a=abs(a);  
    long long int d=a%b;  
    long long int e=gcd(d,b);  
    if(c==0){  
        if(d==0) cout<<0;  
        else if(temp_a>0) printf("%d/%d",d/e,b/e);  
        else if(temp_a<0) printf("(-%d/%d)",d/e,b/e);  
    }else if(c>0){  
        if(d==0) printf("%d",c);  
        else printf("%d %d/%d",c,d/e,b/e);  
    }else{  
        if(d==0) printf("(%d)",c);  
        else printf("(%d %d/%d)",c,d/e,b/e);  
    }  
}  
int main(){  
    long long int a1,b1,a2,b2;  
    scanf("%lld/%lld %lld/%lld",&a1,&b1,&a2,&b2);  
    /*add*/  
    out(a1,b1);cout<<" + ";out(a2,b2);cout<<" = ";out(a1*b2+a2*b1,b1*b2);cout<<endl;  
    /*subtract*/  
    out(a1,b1);cout<<" - ";out(a2,b2);cout<<" = ";out(a1*b2-a2*b1,b1*b2);cout<<endl;  
    /*multiply*/  
    out(a1,b1);cout<<" * ";out(a2,b2);cout<<" = ";out(a1*a2,b1*b2);cout<<endl;  
    /*divide*/  
    out(a1,b1);cout<<" / ";out(a2,b2);cout<<" = ";  
    if(a2==0) cout<<"Inf";  
    else out(a1*b2,b1*a2);  
    return 0;  
}