Answer:
#include <bits/stdc++.h>
using namespace std;
// function to swap largest to third, smallest to first and middle to second
void valueSwap(double *a,double *b,double *c)
{
// variables
double f,s,t;
// if value of first is greater than second
if(*a>=*b)
{
// if value of first is greater than third
if(*a>=*c)
{
// swap
t = *a;
if(*c>=*b)
{
s = *c;
f = *b;
}
else
{
//swap
f = *c;
s = *b;
}
}
else
{
//after all the swap
f = *b;
s = *a;
t = *c;
}
}
else
{
// if value of second is greater than third
if(*b>=*c)
{
t = *b;
if(*c>=*a)
{
// swap
s = *c;
f = *a;
}
else
{
//swap
f = *c;
s = *a;
}
}
else
{
// after all the swap
t = *c;
s = *b;
f = *a;
}
}
// final values
*a = f;
*b = s;
*c = t;
}
// main function
int main()
{
// variables
double n1,n2,n3;
// ask to enter first number
cout<<"Enter the first number:";
// read first number
cin>>n1;
// ask to enter second number
cout<<"Enter the second number:";
// read second number
cin>>n2;
// ask to enter third number
cout<<"Enter the third number:";
// read third number
cin>>n3;
// call the function to swap values with address parameter
valueSwap(&n1,&n2,&n3);
// print number after swapping
cout<<"Number after swapping: "<<n1<<" "<<n2<<" "<<n3<<endl;
return 0;
}
Step-by-step explanation:
Ask user to enter 3 double numbers.Then read 3 numbers from user and assign them to variables "n1","n2" and "n3" respectively.Call the function valueSwap() which take address of all three variables as argument and then assign the largest value among the three to variable "n3" and smallest to "n1" and middle to variable "n2". Print the values after swapping.
Output:
Enter the first number:20
Enter the second number:30
Enter the third number:10
Number after swapping: 10 20 30