C++

Forum

 
Passing an input file by reference into a function that returns a string

cheagle5 (12)
So i am supposed to pass an input file by reference into a function that returns a string type. The point is to read the name of the person in the file and returns the name to main.



1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 
#include <iostream>
#include <fstream>
using namespace std;

string contestantName();
void getJudgeData();
void calcScore();
double findLowest(int,int,int,int,int);
double findHighest(int,int,int,int,int);

int main(int argc, const char * argv[])
{
    ifstream inFile;
    inFile.open("starsearch.docx");
    
    ifstream outFile;
    outFile.open("results.docx");
    
    int number;
    inFile >> number;
    
    for (int count = 1; count <= number; count ++)
    {
        string name;
        contestantName(name);
        getJudgeData(score1);
        getJudgeData(score2);
        getJudgeData(score3);
        getJudgeData(score4);
        getJudgeData(score5);
        
        calcScore();
     
    }
   
    inFile.close();
    outFile.close();
    return 0;
}

string contestantName(& inFile)
{
    inFile >> name;
    return name;

}


So basically, this code reads the the first item in the file, which determines how many contestants there are. Then the part i am having trouble with is that Xcode is giving me hell because it wants me to put a semicolon after the contestantName function. The other function calls are for parts of the program i didn't include. what am i doing wrong?
Peter87 (11234)
Line 5: You have forgot to list the parameter type.

Line 25: You are passing a string but I think you want to pass inFile? The string should probably be assigned the return value of the function instead.

line 41: You have forgot to mention what type of reference.

line 43: There is no variable name in scope. You probably want to create it as a local variable on the previous line.

Last edited on
cheagle5 (12)
how do i list an input file as the parameter type in the prototype.
and all we have learned so far is that the ampersand passes by reference. nothing else after that.
Peter87 (11234)
Line 5:
 
 
string contestantName(ifstream&);


Line 41: 
 
 
string contestantName(ifstream& inFile)
cheagle5 (12)
That worked. 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
 


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

string contestantName(ifstream&);
void getJudgeData(int&);
void calcScore(ofstream&, string, int, int, int, int, int);
double findLowest(int,int,int,int,int);
double findHighest(int,int,int,int,int);

int main(int argc, const char * argv[])
{
    ifstream inFile;
    inFile.open("starsearch.docx");
    
    ofstream outFile;
    outFile.open("results.docx");
    
    int number;
    inFile >> number;
    
    for (int count = 1; count <= number; count ++)
    {
        int score1, score2, score3, score4, score5;
        contestantName(inFile);
        getJudgeData(score1);
        getJudgeData(score2);
        getJudgeData(score3);
        getJudgeData(score4);
        getJudgeData(score5);
        
        calcScore(outFile);
     
    }
   
    inFile.close();
    outFile.close();
    return 0;
}

string contestantName(ifstream& inFile)
{
    string name;
    inFile >> name;
    return name;

}

void getJudgeData(int &score)
{
    inFile >> score;


}
void calcScore(ofstream& outFile,string name, int score1,int score2,int score3,int score4,int score5)
{
    double lowScore, highScore;
    findLowest();
    findHighest();
    double average = (score1 + score2 + score3+ score4 + score5 - lowScore - highScore)/3;
    outFile << name << \t << average << endl;

}

double findLowest(int score1,int score2,int score3,int score4,int score5)
{
    int lowScore = score1;
    if (score2 < lowScore)
        lowScore = score2;
    if (score3 < lowScore)
        lowScore = score3;
    if (score4 < lowScore)
        lowScore = score4;
    if (score5 < lowScore)
        lowScore = score5;
    return lowScore;
}

double findHighest(int score1,int score2,int score3,int score4,int score5)
{
    int highScore = score1;
    if (score2 > highScore)
        highScore = score2;
    if (score3 > highScore)
        highScore = score3;
    if (score4 > highScore)
        highScore = score4;
    if (score5 > highScore)
        highScore = score5;
    return highScore;


}


this is what i have so far. Xcode is saying that in line 34, the function calcScore does not exist. and also for line 60 and 61
Peter87 (11234)
You have declared calcScore to take 7 arguments but on line 34 you only pass 1 argument.
Topic archived. No new replies allowed.