題目描述
本題要求編寫程序,計算2個有理數的和、差、積、商。
輸入格式:
輸入在一行中按照“a1/b1 a2/b2”的格式給出兩個分數形式的有理數,其中分子和分母全是整型範圍內的整數,負號只可能出現在分子前,分母不爲0。
輸出格式:
分別在4行中按照“有理數1 運算符 有理數2 = 結果”的格式順序輸出2個有理數的和、差、積、商。注意輸出的每個有理數必須是該有理數的最簡形式“k a/b”,其中k是整數部分,a/b是最簡分數部分;若爲負數,則須加括號;若除法分母爲0,則輸出“Inf”。題目保證正確的輸出中沒有超過整型範圍的整數。
輸入樣例1:
2/3 -4/2
輸出樣例1:
2/3 + (-2) = (-1 1/3)
2/3 - (-2) = 2 2/3
2/3 * (-2) = (-1 1/3)
2/3 / (-2) = (-1/3)
輸入樣例2:
5/3 0/6
輸出樣例2:
1 2/3 + 0 = 1 2/3
1 2/3 - 0 = 1 2/3
1 2/3 * 0 = 0
1 2/3 / 0 = Inf
C++代碼
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
typedef long long LL;
struct Fraction{
LL up,down;
};
//gcd
LL gcd(LL a,LL b){
if(b == 0) return a;
else gcd(b,a%b);
}
//約分
Fraction reduction(Fraction a){
LL d = gcd(abs(a.up), abs(a.down));
a.up /= d;
a.down /= d;
return a;
}
//加法
Fraction add(Fraction a, Fraction b) {
Fraction res;
res.up = a.up*b.down + b.up*a.down;
res.down = a.down * b.down;
return reduction(res);
}
//減法
Fraction minu(Fraction a, Fraction b) {
Fraction res;
res.up = a.up*b.down - b.up*a.down;
res.down = a.down * b.down;
return reduction(res);
}
//乘法
Fraction multi(Fraction a, Fraction b) {
Fraction res;
res.up = a.up*b.up;
res.down = a.down * b.down;
return reduction(res);
}
//除法
Fraction divide(Fraction a, Fraction b) {
Fraction res;
res.up = a.up*b.down;
res.down = a.down * b.up;
return reduction(res);
}
//輸出某個分數
void printFraction(Fraction a){
a = reduction(a); //對a化簡;
if(a.up == 0){
printf("0");
return ;
}
if(abs(a.down) == 1){
if(a.up * a.down > 0){ //正分數
printf("%lld",abs(a.up));
}else{ //負分數
printf("(-%lld)",abs(a.up));
}
return;
}
if(abs(a.up) > abs(a.down)){
LL integer = a.up / a.down;
if(integer < 0){
printf("(%lld %lld/%lld)",integer, abs(a.up)%abs(a.down), abs(a.down));
}else{
printf("%lld %lld/%lld",integer, abs(a.up)%abs(a.down), abs(a.down));
}
return ;
}
//如果是真分數,則正常輸出
if(a.up*a.down < 0){ //分數負數
printf("(-%lld/%lld)",abs(a.up), abs(a.down));
}else{ //分數爲正
printf("%lld/%lld",abs(a.up),abs(a.down));
}
}
//輸出等號後面的部分
void printRes(Fraction res){
printf(" = ");
printFraction(res);
printf("\n");
}
int main(){
Fraction a, b;
scanf("%lld/%lld %lld/%lld",&a.up,&a.down,&b.up,&b.down);
Fraction res;
//加法
res = add(a,b);
printFraction(a);
printf(" + ");
printFraction(b);
printRes(res);
//減法
res = minu(a,b);
printFraction(a);
printf(" - ");
printFraction(b);
printRes(res);
//乘法
res = multi(a,b);
printFraction(a);
printf(" * ");
printFraction(b);
printRes(res);
//除法
printFraction(a);
printf(" / ");
printFraction(b);
if(abs(b.up) == 0 ){
printf(" = Inf\n");
}else{
res = divide(a,b);
printRes(res);
}
return 0;
}