dec

as1.cpp

@@ -193,44 +193,105 @@ int Fraction::get_common_divisor() const
     return t_top;
 }
 
-/*
-void get_decimal_repeating_part(double f)
-{
-    double t_dec = f - (int)f;
 
-    
-}
-*/
-int get_double_decimals_length(double d)
+
+
+unsigned long int transfer_double_decimals_to_unsigned_long_int_for_single(const double& d)
 {
-    ostringstream out;
-    //out.precision(18);//覆盖默认精度
-    out<<d;
-    string s= out.str();
-    return s.length();
+    if(d > 0.09999999999 && d < 0.100000000001) return 1;
+    if(d > 0.19999999999 && d < 0.200000000001) return 2;
+    if(d > 0.29999999999 && d < 0.300000000001) return 3;
+    if(d > 0.39999999999 && d < 0.400000000001) return 4;
+    if(d > 0.49999999999 && d < 0.500000000001) return 5;
+    if(d > 0.59999999999 && d < 0.600000000001) return 6;
+    if(d > 0.69999999999 && d < 0.700000000001) return 7;
+    if(d > 0.79999999999 && d < 0.800000000001) return 8;
+    if(d > 0.89999999999 && d < 0.900000000001) return 9;
+    return 0;
 }
 
 
-/* 两位以上*/
-unsigned long int transfer_double_decimals_to_unsigned_long_int(double d)
+unsigned long int transfer_double_decimals_to_unsigned_long_int(const double& d)
 {
+    if(transfer_double_decimals_to_unsigned_long_int_for_single(d)) return transfer_double_decimals_to_unsigned_long_int_for_single(d);
+
     unsigned long int t = (unsigned long int)(d*(1000000000));
 
-    while(d != 0 && t % (t/10) == 0 && t > 100) t /= 10;
+    while(d != 0 && (t % (t/10) == 0 || t % (t/10) == 9) && t > 100) t /= 10;
+
+    if((unsigned long int)(d*(1000000000)) % 1000 == 999) return ++t;
 
     return t;
 }
 
 
-inline unsigned long int get_double_decimals_part(double d)
+inline unsigned long int get_double_decimals_part(const double& d)
 {
-    return transfer_double_decimals_to_unsigned_long_int(d-floor(d));
+    double t;
+    return transfer_double_decimals_to_unsigned_long_int(fabs(d) - floor(fabs(d)));
 } 
 
+inline unsigned long int get_double_integer_part(const double& d)
+{
+    return (unsigned long int)floor(fabs(d));
+}
+
+inline bool get_double_is_negative(const double& d)
+{
+    return (d < 0)? true : false;
+}
+
+
+inline unsigned short get_one_decimal(const unsigned long int& t, unsigned short point)
+{
+    return (t / (unsigned int)pow(10, point - 1)) % 10;
+}
+
+unsigned short get_long_int_length(long int t)
+{
+    int count = 0;
+    while(t){
+
+        t /= 10;
+        count++;
+    }
+
+    return count;
+}
+
 
+unsigned int get_repeart_part(const unsigned long int& t)
+{
+    unsigned short i = 1;
+    unsigned short len = get_long_int_length(t);
 
+    while(i < len){
 
+        unsigned short count = 0;
+        while(i < len && get_one_decimal(t, ++i) != get_one_decimal(t, 1));
+
+        for(unsigned short j = 1; j < i; j++){
+
+            if(get_one_decimal(t, j) == get_one_decimal(t, j + i - 1)) count++;
+        }
+
+        if(count == i - 1) return t % (unsigned int)pow(10, i - 1);
+    }
 
+    return 0;
+}
+/*
+void repeated_decimal_to_fraction(double d)
+{
+    get_double_integer_part(d)
+    unsigned long int decimal = get_double_decimals_part(d);
+    unsigned int body = get_repeart_part(decimal);
+
+    for(unsigned short i = get_long_int_length(body); i < )
+
+}
+
+*/
 int main()
 {
     vector<int> a;
@@ -246,8 +307,8 @@ int main()
    // for(int i =0; i < a.size(); i++) cout << a[i] <<endl;
 
     //try{
-    cout << get_double_decimals_part(34234)<<endl;
-    //cout << f.val();
+
+    cout << get_repeart_part(132123354) << endl ;
     //}catch(const char* msg){
      //   cerr << msg << endl;
     //}