1088

a x b = c

将a,b,c用out统一输出

AC代码：

#include <cstdio>
#include <string>
using namespace std;
long long gcd(long long x,long long y){
    if(x == 0)
        return y;
    if(y == 0)
        return x;
    if(x < 0)
        x = -x;
    if(y < 0)
        y = -y;
    long long max,min;
    max = x > y ? x : y;
    min = x > y ? y : x;
    while(max % min != 0){
        long long tmp(min);
        min = max % min;
        max = tmp;
    }
    return min;
}
void out(long long an,long long ad){
    if(ad == 0){
        printf("Inf");
        return;
    }
    if(ad < 0){
        ad = -ad;
        an = -an;
    }
    long long ai,g;
    ai = an / ad;
    an = an - ai * ad;
    g = gcd(an,ad);
    an /= g;
    ad /= g;
    if(ai != 0){
        an = an > -an ? an : -an;
        if(an != 0){
            if(ai < 0){
                printf("(%lld %lld/%lld)",ai,an,ad);
            }
            else{
                printf("%lld %lld/%lld",ai,an,ad);
            }
        }
        else{
            if(ai < 0){
                printf("(%lld)",ai);
            }
            else
                printf("%lld",ai);
        }
    }
    else{
        if(an == 0)
            printf("0");
        else if(an < 0)
            printf("(%lld/%lld)",an,ad);
        else
            printf("%lld/%lld",an,ad);
    }
}
int main(){
    long long an,ad,bn,bd;
    scanf("%lld/%lld %lld/%lld",&an,&ad,&bn,&bd);
    out(an,ad);
    printf(" + ");
    out(bn,bd);
    printf(" = ");
    out(an*bd+bn*ad,ad*bd);
    printf("
");

    out(an,ad);
    printf(" - ");
    out(bn,bd);
    printf(" = ");
    out(an*bd-bn*ad,ad*bd);
    printf("
");

    out(an,ad);
    printf(" * ");
    out(bn,bd);
    printf(" = ");
    out(an*bn,ad*bd);
    printf("
");

    out(an,ad);
    printf(" / ");
    out(bn,bd);
    printf(" = ");
    out(an*bd,ad*bn);
    printf("
");

    return 0;
}