48 lines
1,023 B
C++
48 lines
1,023 B
C++
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#include<iostream>
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using namespace std;
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long double Kommazahl(const std::string& str)
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{
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/*long double Zahl; //Alternative mit stold welche in der Deklaration der Nebenfunktion zus<75>tzlich einen boolean wert ben<65>tigt ob es mt oder ohne Kommas arbeiten soll
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bool Minus = false;
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std::string::size_type idx;
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std::string FNum = "";
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for(char c:str)
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{
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if(c>='0' && c<='9') FNum += c;
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else if(c == '-') Minus = true;
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else if((c=='.' || c==',') && Komma) Komma = false, FNum += c;
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}
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Zahl = std::stold(FNum,&idx);
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if(Minus) Zahl*=-1;
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return(Zahl);*/
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bool Komma=false, Minus=false;
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long double Zahl = 0;
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unsigned short Stelle = 0;
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for(char c : str)
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{
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if(c>='0' && c<='9')
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{
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if(Komma == false)
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{
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Zahl *= 10;
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Zahl += c - '0';
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}
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else
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{
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long double Zahl2 = c - '0';
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for(unsigned short idx = 0; idx <= Stelle; idx++) Zahl2/=10;
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Zahl += Zahl2;
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Stelle++;
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}
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}
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else if(c=='.') Komma=true;
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else if(c=='-') Minus=true;
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}
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if(Minus==true) Zahl*=-1;
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return(Zahl);
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}
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