蓝桥杯 ADV-120 算法提高 6-17复数四则运算

设计复数库，实现基本的复数加减乘除运算。
输入时只需分别键入实部和虚部，以空格分割，两个复数之间用运算符分隔；输出时按a+bi的格式在屏幕上打印结果。参加样例输入和样例输出。
注意考虑特殊情况，无法计算时输出字符串”error”。
样例输入
2 4 * -3 2
样例输出
-14-8i
样例输入
3 -2 + -1 3
样例输出
2+1i
分析：除法的时候有点麻烦，结果要变成浮点型，因为测试用例的答案是统一输出一位有效数字的。。所以0.123输出0.1 1.000输出1。。。我用了cout的setprecision控制输出的有效数字个数~

#include <iostream>
#include <iomanip>
using namespace std;

void add(int a, int b, int m, int n);
void min(int a, int b, int m, int n);
void multi(int a, int b, int m, int n);
void div1(int a, int b, int m, int n);

int main() {
    int a,b,m,n;
    char c;
    cin >> a >> b;
    cin >> c;
    cin >> m >> n;
    switch(c) {
        case '+': add(a, b, m, n); break;
        case '-': min(a, b, m, n); break;
        case '*': multi(a, b, m, n); break;
        case '/': div1(a, b, m, n); break;
    }
    return 0;
}

void add(int a, int b, int m, int n) {
    int l, r;
    l = a + m;
    r = b + n;
    if (l != 0){
        if (r != 0) {
            if (r > 0)
                cout << l << "+" << r << "i";
            else
                cout << l << r << "i";
        }
        else {
            cout << l;
        }
    }
    else {
        if (r != 0) {
            cout << r << "i";
        }
        else {
            cout << 0;
        }
    }
}

void min(int a, int b, int m, int n) {
    int l, r;
    l = a - m;
    r = b - n;
    if (l != 0) {
        if (r != 0) {
            if (r > 0)
                cout << l << "+" << r << "i";
            else
                cout << l << r << "i";
        }
        else {
            cout << l;
        }
    }
    else {
        if (r != 0) {
            cout << r << "i";
        }
        else {
            cout << 0;
        }
    }
}

void multi(int a, int b, int m, int n) {
    int l, r;
    l = a * m - b * n;
    r = a * n + b * m;
    if (l != 0) {
        if (r != 0) {
            if (r > 0)
                cout << l << "+" << r << "i";
            else
                cout << l << r << "i";
        }
        else {
            cout << l;
        }
    }
    else {
        if (r != 0) {
            cout << r << "i";
        }
        else {
            cout << 0;
        }
    }
}

void div1(int a, int b, int m, int n) {
    if (m == 0 && n == 0) {
        cout << "error";
    } else {
        double l, r;
        l = (double)(a * m + b * n) / (m * m + n * n);
        r = (double)(b * m - a * n) / (m * m + n * n);
        
        if (l != 0) {
            if (r != 0) {
                if (r > 0) {
                    cout << setprecision(1) << l << "+" << r << endl;
                }
                else {
                    cout << setprecision(1) << l  << r << "i" << endl;
                }
            }
            else {
                cout << setprecision(1) << l << endl;
            }
        } else {
            if (r != 0) {
                cout << setprecision(1) << r << "i" << endl;
            }
            else {
                cout << 0;
            }
        }
    }
}

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#include <iostream>

#include <iomanip>

using namespace std;

void add(int a, int b, int m, int n);

void min(int a, int b, int m, int n);

void multi(int a, int b, int m, int n);

void div1(int a, int b, int m, int n);

int main() {

int a,b,m,n;

char c;

cin >> a >> b;

cin >> c;

cin >> m >> n;

switch(c) {

case '+': add(a, b, m, n); break;

case '-': min(a, b, m, n); break;

case '*': multi(a, b, m, n); break;

case '/': div1(a, b, m, n); break;

}

return 0;

}

void add(int a, int b, int m, int n) {

int l, r;

l = a + m;

r = b + n;

if (l != 0){

if (r != 0) {

if (r > 0)

cout << l << "+" << r << "i";

else

cout << l << r << "i";

}

else {

cout << l;

}

else {

if (r != 0) {

cout << r << "i";

}

else {

cout << 0;

}

void min(int a, int b, int m, int n) {

int l, r;

l = a - m;

r = b - n;

if (l != 0) {

if (r != 0) {

if (r > 0)

cout << l << "+" << r << "i";

else

cout << l << r << "i";

}

else {

cout << l;

}

else {

if (r != 0) {

cout << r << "i";

}

else {

cout << 0;

}

void multi(int a, int b, int m, int n) {

int l, r;

l = a * m - b * n;

r = a * n + b * m;

if (l != 0) {

if (r != 0) {

if (r > 0)

cout << l << "+" << r << "i";

else

cout << l << r << "i";

}

else {

cout << l;

}

else {

if (r != 0) {

cout << r << "i";

}

else {

cout << 0;

}

void div1(int a, int b, int m, int n) {

if (m == 0 && n == 0) {

cout << "error";

} else {

double l, r;

l = (double)(a * m + b * n) / (m * m + n * n);

r = (double)(b * m - a * n) / (m * m + n * n);

if (l != 0) {

if (r != 0) {

if (r > 0) {

cout << setprecision(1) << l << "+" << r << endl;

}

else {

cout << setprecision(1) << l << r << "i" << endl;

}

else {

cout << setprecision(1) << l << endl;

}

} else {

if (r != 0) {

cout << setprecision(1) << r << "i" << endl;

}

else {

cout << 0;

}

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