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C++ program to subtraction of two numbers | 6 different Methods

Subtract two numbers

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C++ program to subtraction of two numbers | 6 different Methods

In this tutorial, we will discuss the C++ program to subtraction of two numbers

In this post, we are going to learn how to find subtraction of two numbers via different 6 ways

Subtraction of two numbers – standard method

Program 1

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num1,num2,sub;//variable declaration
    num1=567;
    num2=321;

sub=num1-num2;//calculate the subtraction
    cout<<"subtraction of "<<num1<<" and "<<num2<<" :"<<sub;
    //display the result of subtraction
    getch();
    return 0;
}

When the above code is executed, it produces the following result

subtraction of 567 and 321 : 246

In this program,

Integer variable num1 and num2 both are declared and initialized
The num1 and num2 both are subtracted together and the value assigned to the integer variable sub
Finally the program is displayed the output using cout<<

Subtraction of two numbers-Using user input

Program 2

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num1,num2,sub;//variable declaration
    cout<<"Enter the first number: ";
    cin>>num1;//read value for num1
    cout<<"Enter the second number: ";
    cin>>num2;//read value for num2

sub=num1-num2;//calculate the subtraction
    cout<<"subtraction of "<<num1<<" and "<<num2<<" :"<<sub;
    //display the result of subtraction
    getch();
    return 0;
}

When the above code is executed, it produces the following result

Enter the first number: 987
Enter the first number: 789
Subtraction of 987 and 789 : 198

in tis program,

Integer variable num1 and num2 both are declared,
The program takes input from the user
Then the user enters the input value for num1, num2
The program will read the input using cin>> and store the variables in num1, num2.
The num1 and num2 both are subtracted together and the value assigned to the integer variable sub
Finally the program is displayed the output using cout<<

Subtraction of two numbers – using function

Program 3

#include <iostream>
#include <conio.h>
using namespace std;

int subNum(int a, int b);//Function prototype
int main()
{
    int result,num1,num2;
    cout<<"Enter two numbers to subtract\n";
    cin>>num1>>num2;

    result=subNum(num1,num2);
     cout<<"subtraction of given two numbers:"<<result;
     getch();
    return 0;
}
int subNum(int x, int y)
{
    int c=x-y;
    return (c);
}

When the above code is executed, it produces the following result

Enter two numbers to subtract
1000
345
subtraction of given two numbers: 655

Declare a function named as sub() with two int parameters
Declare num1,num2 and result.
The program takes input from the user
Then the user enters the input value for num1, num2
The program will read the input using cin>> and store the variables in num1, num2 respectively
Define the function (sub())for find sum
Call the function to produce output
Finally, the program displays the result of subtraction using cout<<

Subtraction of two numbers – using recursion

Program 4

#include <iostream>
#include <conio.h>
using namespace std;

int subNum(int a, int b);//Function prototype
int main()
{
    int result,num1,num2;
    cout<<"Enter two numbers to subtract\n";
    cin>>num1>>num2;

    result=subNum(num1,num2);
     cout<<"subtraction of given two numbers:"<<result;
     getch();
    return 0;
}
int subNum(int num1, int num2)
{
    if(num2==0)
        return num1;
    else
        return subNum((num1-1),(num2-1));
}

When the above code is executed, it produces the following result

Enter two numbers to subtract
1200
450
subtraction of given two numbers: 750

Declare a function named as sub() with two int parameters
Declare num1,num2 and result.
The program takes input from the user
Then the user enters the input value for num1, num2
The program will read the input using cin>> and store the variables in num1, num2 respectively
Define the function (sub())for find subtraction recursively
Call the function to produce output
Finally, the program displays the result of subtraction using cout<<

Subtraction of two numbers – using pointer

Program 5

#include <iostream>
#include <conio.h>
using namespace std;

int subNum(int *a, int *b);//Function prototype
int main()
{
    int result,num1,num2;
    cout<<"Enter two numbers to subtract\n";
    cin>>num1>>num2;

    result=subNum(&num1,&num2);
     cout<<"subtraction of given two numbers:"<<result;
     getch();
    return 0;
}
int subNum(int *a, int *b)
{
    int temp;
    temp=*a-*b;
    return temp;
}

When the above code is executed, it produces the following result

Enter two numbers to subtract
1234
123
subtraction of given two numbers: 1111

Declare variables num1,num2 and result.
The program takes input from the user
Then the user enters the input value for num1, num2
The program will read the input using cin>> and store the variables in num1, num2 respectively
Define the function (sub()) for find subtraction
Pass the parameter to the function as pointer variable(int *a, int *b)
Call the function to produce output
Assign the value to result variable
Finally, the program displays the result of subtraction using cout<<

Subtraction of two numbers – without – operator

Program 6

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int num1,num2,sub;//variale declaration

    //input first number
    cout<<"Enter the first number\n";
    cin>>num1;//read first number

    //input second number
    cout<<"Enter the second number\n";
    cin>>num2;//read second number

    sub=num1+~num2+1;//calculate the subtraction
     cout<<"subtraction of"<<num1<<"-"<<num2<<":"<<sub;
     //display the result
getch();
    return 0;
}

When the above code is executed, it produces the following result

Enter the first number
678
Enter the second number
234
subtraction of 678-234: 444

Declare variables num1,num2 and sub.
The program takes input from the user
Then the user enters the input value for num1, num2
The program will read the input using cin>> and store the variables in num1, num2 respectively
Calculate the subtraction of num1,num2
Finally, the program displays the result of subtraction using cout<<