https://pintia.cn/problem-sets/994805342720868352/problems/994805378443755520
PAT乙級的原題，直接模擬即可

#include<bits/stdc++.h> using namespace std; typedef long long int LL; LL a,b,c,d; LL gcd(LL a,LL b) {return b?gcd(b,a%b):a;} void print(LL a,LL b) {LL temp=gcd(abs(a),abs(b));int flag=1;//記錄數的正負if(a<0) flag=flag*(-1),a=abs(a);if(b<0) flag=flag*(-1),b=abs(b);a/=temp,b/=temp;LL cnt=a/b;a=a-cnt*b;if(cnt==0&&a==0) flag=1;if(flag<0) cout<<"(";if(a==0) printf("%lld",cnt*flag);else if(cnt&&a) printf("%lld %lld/%lld",cnt*flag,a,b);else if(!cnt&&a) printf("%lld/%lld",a*flag,b);if(flag<0) cout<<")"; } int main(void) {scanf("%lld/%lld %lld/%lld",&a,&b,&c,&d);print(a,b),printf(" + "),print(c,d),printf(" = "),print(a*d+c*b,b*d);puts("");print(a,b),printf(" - "),print(c,d),printf(" = "),print(a*d-c*b,b*d);puts("");print(a,b),printf(" * "),print(c,d),printf(" = "),print(a*c,b*d);puts("");print(a,b),printf(" / "),print(c,d),printf(" = ");if(b*c!=0) print(a*d,b*c);else printf("Inf");return 0; }

總結

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