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QuestionWhy can't variables be declared in a switch statement Pin
tracyhe12313-May-18 20:34
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AnswerRe: Why can't variables be declared in a switch statement Pin
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Questionwhy passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
Tarun Jha13-May-18 1:46
memberTarun Jha13-May-18 1:46 
in the below program it i have used both ways i.e. passed arguments by reference and pointers.

1. Arguments by reference:

#include <iostream>
using namespace std;

template<class T>
void swap(T &x, T &y){
    T temp = x;
    x = y;
    y = temp;
}

void fun(int m, int n, float a, float b){

    cout << "m & n before swap: " << m << " " << n << endl;
    swap(m, n);
    cout << "m & n after swap: " << m << " " << n << endl;

    cout << "i & j before swap: " << a << " " << b << endl;
    swap(a, b);
    cout << "i & j after swap: " << a << " " << b << endl;
}

int main(){
    fun(100, 200, 11.22, 33.44);

    return 0;
}


2. Arguments by pointers:
#include <iostream>
using namespace std;

template<class T>
void swap(T *x, T *y){
    T temp = x;
    x = y;
    y = temp;
}

void fun(int m, int n, float a, float b){

    cout << "m & n before swap: " << m << " " << n << endl;
    swap(m, n);
    cout << "m & n after swap: " << m << " " << n << endl;

    cout << "i & j before swap: " << a << " " << b << endl;
    swap(a, b);
    cout << "i & j after swap: " << a << " " << b << endl;
}

int main(){
    fun(100, 200, 11.22, 33.44);

    return 0;
}



also if i pass the arguments by reference but make it a constant then also i works, why ?
#include <iostream>
using namespace std;

template<class T>
void swap(const T &x, const T &y){
    T temp = x;
    x = y;
    y = temp;
}

void fun(int m, int n, float a, float b){

    cout << "m & n before swap: " << m << " " << n << endl;
    swap(m, n);
    cout << "m & n after swap: " << m << " " << n << endl;

    cout << "i & j before swap: " << a << " " << b << endl;
    swap(a, b);
    cout << "i & j after swap: " << a << " " << b << endl;
}

int main(){
    fun(100, 200, 11.22, 33.44);

    return 0;
}


Thank you.
AnswerRe: why passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
CPallini13-May-18 2:56
mveCPallini13-May-18 2:56 
GeneralRe: why passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
Tarun Jha26-May-18 9:50
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GeneralRe: why passing argument by reference(&ref) in a template function shows error ? but works fine if arguments passed by pointer(*ptr) ? Pin
CPallini26-May-18 10:53
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Questionproblem encountered by calling constructors explicitly. Pin
Tarun Jha11-May-18 10:20
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AnswerRe: problem encountered by calling constructors explicitly. Pin
Joe Woodbury11-May-18 11:39
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GeneralRe: problem encountered by calling constructors explicitly. Pin
Tarun Jha11-May-18 11:57
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AnswerRe: problem encountered by calling constructors explicitly. Pin
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Questionvs2005 Form window Error C2039 Pin
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