Forum: Vad är fel?

 
#include <iostream>
#include <string>
#include <iodos.h>
using namespace std;
using std::cout;
using std::cin;
 
int fatoce(float tal_1);
 
int fatoce(float tal_1) {
    float summa;
    
    summa = tal_1 - 32 * 5 / 9;
    
    return summa;
}
int main() {
    float val;
    float tal_1;
    dos_console();
    cout << "Vad vill du göra?\n";
    cout << "1. Konvertera ifrån Fahrenheit  till Celsius\n";
    cout << "2. Konvertera ifrån Celsius till Fahrenheit\n";
    cin >> val;
    if (val == 1); {
            cout << "Skriv in antalet Fahrenheit \n";
            cin >> tal_1;
            cout << "\n" << fatoce(tal_1);
            cout << "\n";
            }
    
    
    system("PAUSE");
    return 0;
}
 

 
int fatoce (float tal_1) 
{
        float summa;
        summa = tal_1 - 32 * 5 / 9;
        return summa;
}
 

 
summa = (tal_1 - 32) * (5 / 9);
 

 
int fatoce(int tal_1) {
    int rakna1;
    int rakna2;
    int summa;
    rakna1 = tal_1 - 32;
    rakna2 = rakna1 * 5;
    summa = rakna2 / 9;
    
    return summa;
}
 

 
float fatoce (int tal_1) {
	return ((tal_1 - 32) * (5.0 / 9.0));
}
 

 
summa = ((tal_1 - 32) * 5 ) / 9;