Write a function to read a matrix of size m*n from the keyboard.

#include<iostream>
#include<iomanip>
using namespace std;
void matrix(int m,int n)
{
    float **p;
    p=new float*[m];
    for(int i=0;i<m;i++)
    {
        p[i]=new float[n];
    }
    cout<<" Enter "<<m<<"by"<<n<<" matrix elements one by one "<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            float value;
            cin>>value;
            p[i][j]=value;
        }
    }
    cout<<" The given matrix is :"<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            cout<<p[i][j]<<"   ";
        }
        cout<<"\n";
    }
}
 
int main()
{
    int r,c;
    cout<<" Enter size of matrix : ";
    cin>>r>>c;
    matrix(r,c);
    return 0;
}

Write a program to read a matrix of size m*n from the keyboard and display the same on the screen using function.

#include<iostream>
#include<iomanip>
using namespace std;
void matrix(int m,int n)
{
    float **p;
    p=new float*[m];
    for(int i=0;i<m;i++)
    {
        p[i]=new float[n];
    }
    cout<<" Enter "<<m<<" by "<<n<<" matrix elements one by one "<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            float value;
            cin>>value;
            p[i][j]=value;
        }
    }
    cout<<" The given matrix is :"<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            cout<<p[i][j]<<"   ";
        }
        cout<<"\n";
    }
}
 
int main()
{
    int r,c;
    cout<<" Enter size of matrix : ";
    cin>>r>>c;
    matrix(r,c);
    return 0;
}

Rewrite the program of Exercise 4.2 to make the row parameter of the matrix as a default argument.

#include<iostream>
#include<iomanip>
using namespace std; 
void matrix(int n,int m=3)
{
    float **p;
    p=new float*[m];
    for(int i=0;i<m;i++)
    {
        p[i]=new float[n];
    }
    cout<<" Enter "<<m<<" by "<<n<<" matrix elements one by one "<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            float value;
            cin>>value;
            p[i][j]=value;
        }
    }
    cout<<" The given matrix is :"<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            cout<<p[i][j]<<"   ";
        }
        cout<<"\n";
    }
}
 
int main()
{
    int c;
    cout<<" Enter column of matrix : ";
    cin>>c;
    matrix(c);
    return 0;
}

The effect of a default argument can be alternatively achieved by overloading. Discuss with examples.

#include<iostream>
#include<iomanip>
using namespace std;
void matrix(int m,int n)
{
    float **p;
    p=new float*[m];
    for(int i=0;i<m;i++)
    {
        p[i]=new float[n];
    }
    cout<<" Enter "<<m<<"by"<<n<<" matrix elements one by one "<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            float value;
            cin>>value;
            p[i][j]=value;
        }
    }
    cout<<" The given matrix is :"<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            cout<<p[i][j]<<"   ";
        }
        cout<<"\n";
    }
}
void matrix(int m,long int n=3)
{
    float **p;
    p=new float*[m];
 
          for(int i=0;i<m;i++)
    {
        p[i]=new float[n];
    }
    cout<<" Enter "<<m<<" by "<<n<<" matrix elements one by one "<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            float value;
            cin>>value;
            p[i][j]=value;
        }
    }
    cout<<" The given matrix is :"<<endl;
    for(i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            cout<<p[i][j]<<"   ";
        }
        cout<<"\n";
    }
}
 
int main()
{
    int r;
    cout<<" Enter row of matrix : ";
    cin>>r;
    matrix(r);
    return 0;
}

Write a macro that obtains the largest of the three numbers.

#include<iostream>
#include<iomanip>
using namespace std; 
float  large(float a,float b,float c)
{
    float largest;
    if(a>b)
    {
        if(a>c)
            largest=a;
        else
            largest=c;
    }
    else
    {
        if(b>c)
            largest=b;
        else
            largest=c;
    }
    return largest;
}
 
int main()
{
    float x,y,z;
    cout<<" Enter three values : ";
    cin>>x>>y>>z;
    float largest=large(x,y,z);
    cout<<" large = "<<largest<<endl;
    return 0;
}

Redo Exercise 4.16 using inline function. Test the function using a main function.

Missing

Write a function power() to raise a number m to power n. The function takes a double value for m and int value for n and returns the result correctly. Use a default value of 2 for n to make the function to calculate the squares when this argument is omitted. Write a main that gets the values of m and n from the user to test the function.

#include<iostream>
#include<iomanip>
#include<math>
using namespace std; 
long double power(double m,int n)
{
    long double mn=pow(m,n);
    return mn;
}
long double power(double m,long int n=2)
{
    long double mn=pow(m,n);
    return mn;
}
int main()
{
    long double mn;
    double m;
    int n;
 
    cout<<" Enter the value of m & n"<<endl;
    cin>>m>>n;
    mn=power(m,n);
    cout<<" m to power n : "<<mn<<endl;
    mn=power(m);
    cout<<" m to power n : "<<mn<<endl;
    return 0;
}

Write a function that performs the same operation as that of Exercise 4.18 but takes an int value for m. Both the functions should have the same name. Write a main that calls both the functions. Use the concept of function overloading.

#include<iostream>
#include<iomanip>
#include<math>
using name space std; 
long double power(int m,int n)
{
    long double mn= (long double)pow(m,n);
    return mn;
}
long double power(int m,long int n=2)
{
    long double mn=(long double)pow(m,n);
    return mn;
}
int main()
{
    long double mn;
    int m;
    int n;
 
    cout<<" Enter the value of m & n"<<endl;
    cin>>m>>n;
    mn=power(m,n);
    cout<<" m to power n : "<<mn<<endl;
    mn=power(m);
    cout<<" m to power n : "<<mn<<endl;
    return 0;
}

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