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  1. #include <stdio.h>
  2. #include <string>
  3.  
  4. class Complex {
  5. private:
  6.     int a, b;
  7.  
  8. public:
  9.     Complex(int real) {
  10.         a = real;
  11.         b = 0;
  12.     }
  13.  
  14.     Complex(int real, int imag) {
  15.         a = real;
  16.         b = imag;
  17.     }
  18.  
  19.     Complex(const Complex &c) {
  20.         *this = c;
  21.     }
  22.  
  23.     Complex &operator=(const Complex &c) {
  24.         a = c.a;
  25.         b = c.b;
  26.         return *this;
  27.     }
  28.  
  29.     Complex &operator+=(const Complex &c) {
  30.         a += c.a;
  31.         b += c.b;
  32.         return *this;
  33.     }
  34.  
  35.     Complex &operator-=(const Complex &c) {
  36.         a -= c.a;
  37.         b -= c.b;
  38.         return *this;
  39.     }
  40.  
  41.     Complex &operator*=(const Complex &c) {
  42.         Complex tmp = *this;
  43.         a = tmp.a * c.a - tmp.b * c.b;
  44.         b = tmp.a * c.b + tmp.b * c.a;
  45.         return *this;
  46.     }
  47.  
  48.     std::string str() const {
  49.         char buf[32];
  50.         if (b == 0) {
  51.             snprintf(buf, sizeof(buf), "%d", a);
  52.         } else if (a == 0) {
  53.             if (b == -1) return "-i";
  54.             if (b ==  1) return  "i";
  55.             snprintf(buf, sizeof(buf), "%di", b);
  56.         } else if (b == -1) {
  57.             snprintf(buf, sizeof(buf), "%d-i", a);
  58.         } else if (b < 0) {
  59.             snprintf(buf, sizeof(buf), "%d%di", a, b);
  60.         } else if (b == 1) {
  61.             snprintf(buf, sizeof(buf), "%d+i", a);
  62.         } else {
  63.             snprintf(buf, sizeof(buf), "%d+%di", a, b);
  64.         }
  65.         return buf;
  66.     }
  67. };
  68.  
  69. Complex operator+(const Complex &c1, const Complex &c2) {
  70.     Complex ret = c1;
  71.     ret += c2;
  72.     return ret;
  73. }
  74.  
  75. Complex operator-(const Complex &c1, const Complex &c2) {
  76.     Complex ret = c1;
  77.     ret -= c2;
  78.     return ret;
  79. }
  80.  
  81. Complex operator*(const Complex &c1, const Complex &c2) {
  82.     Complex ret = c1;
  83.     ret *= c2;
  84.     return ret;
  85. }
  86.  
  87. int main() {
  88.     Complex i(0, 1);
  89.     Complex a = 1 + 2*i;
  90.     Complex b = 3 + 4*i;
  91.     Complex c = a + b;
  92.     Complex d = a * b;
  93.     Complex e = a - 1;
  94.     Complex f = a - 2*i;
  95.     printf("a = %s\n", a.str().c_str());
  96.     printf("b = %s\n", b.str().c_str());
  97.     printf("c = %s\n", c.str().c_str());
  98.     printf("d = %s\n", d.str().c_str());
  99.     printf("e = %s\n", e.str().c_str());
  100.     printf("f = %s\n", f.str().c_str());
  101. }
  102.  
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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a = 1+2i
b = 3+4i
c = 4+6i
d = -5+10i
e = 2i
f = 1
https://ideone.com/jTrhdn
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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