Question

write a C++ program that uses function swap (a,b) to enter two real numbers from the keyboard and uses function min_max(a,b) to return a to be the smaller of the two numbers entered always.

Answer 1

Program in C++:

#include <iostream>
using namespace std;
void swap(int *a,int *b){// swap function 
    int temp;
    temp=*a;
    *a=*b;
    *b=temp;
}
int min_max(int a,int b){
    if(a>b){// if a is greater than b swap value of a and b, and return a(Smaller value).
        swap(&a,&b);
        return a;// return a 
    }
    else{// if a is Smaller then b return a
        return a;// return a
    }
}

int main()
{
    int a,b,min;
    cout<<"Enter the value of a"<<endl;
    cin>>a;// input a
    cout<<"Enter the value of b"<<endl;
    cin>>b; // input b
    min=min_max(a,b);// call min_max function
    cout<<"Smaller value is : "<<min;// print min value

    return 0;
}

Output 1:

Output 2:

Program Screenshot:

Summary:

Program print smaller of the two numbers and function min_max(a,b) always return value of a. So when value of a is greater then b then we swap the values of a and b using swap function.