Question

write the function definition

call the function from main and make sure it works as required.

13. DA void function named CapLock() that takes a char reference parameter. If the parameter is a letter. the function will assign the parameter its opposite case (uppercase becomes lowercase and vica versa); otherwise, it will do nothing. 14. double function named Minimum) that takes four double parameters. It returns the minimum value of the parameters.

Answer 1

The code is in C++. All the explanation is in the code comments. Hope this helps!

Code:

#include <iostream>

using namespace std;

// function 1
void CapLock(char *c)
{
// lowercase letter
if(*c >= 'a' && *c <= 'z')
{
// change to upper case
*c = (*c - 'a') + 'A';
}
// uppercase letter
else if(*c >= 'A' && *c <= 'Z')
{
// change to lowercase
*c = (*c - 'A') + 'a';
}
// else do nothing
}

// function 2
double Minimum(double d1, double d2, double d3, double d4)
{
  
// compare first 2 numbers
if(d1 < d2)
{
// compare 1st and 3rd numbers
if(d1 < d3)
{
// compare 1st and 4th numbers
if(d1 < d4)
// d1 is the Minimum
return d1;

// d4 is the Minimum
return d4;
}
// compare 3rd and 4th numbers
if(d3 < d4)
// d3 is the Minimum
return d3;
  
// d4 is the Minimum
return d4;
}
// compare 2nd and 3rd numbers
if(d2 < d3)
{
// compare 2nd and 4th numbers
if(d2 < d4)
// d2 is the Minimum
return d2;
  
// d4 is the Minimum
return d4;
}
// compare 3rd and 4th numbers
if(d3 < d4)
// d3 is the Minimum
return d3;
  
// d4 is the Minimum
return d4;
}

int main()
{
// sample run
// for function CapLock()
char c1 = 's', c2 = 'T', c3 = '7';
cout << "For " << c1 << ", CapLock() = ";
CapLock(&c1);
cout << c1 << endl;
cout << "For " << c2 << ", CapLock() = ";
CapLock(&c2);
cout << c2 << endl;
cout << "For " << c3 << ", CapLock() = ";
CapLock(&c3);
cout << c3 << endl << endl;
  
// for function 2
double d1 = 13.4, d2 = 10.4, d3 = 9.7, d4 = 13.02;
cout << "Minimum of " << d1 << ", " << d2 << ", " << d3 << " and " << d4 << " = ";
cout << Minimum(d1, d2, d3, d4) << endl;
  
return 0;
}

Sample run:

For s, CapLock() = s For T, Caplock() = t For 7, CapLock() = 7 Minimum of 13.4, 10.4, 9.7 and 13.02 = 9.7

Code screenshot: