C++ Program to Find Sum of Natural Numbers

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Find Sum of Natural Numbers Program in C++

Natural Numbers are counting numbers, that is 1, 2, 3, 4, 5, 6, 7... etc. Remember, zero and negative numbers are not part of natural numbers. In this program, we will take a positive number N as input from user and find the sum of all natural numbers between 1 to N(including 1 and N).


Enter the number of integers to add: 5
1 2 3 4 5 
SUM = 15

To understand below example, you have must knowledge of following C++ programming topics; for looping statements we need know For Loop in C++ and Cout and Cin in C++.

C++ program to find sum of numbers between 1 to N


void main()
    int N=0, num, i, sum=0;
    cout<<"Enter the Number of Integers to Add: ";
    cin >> N;
    cout<<"Enter "<<N<<" Numbers: ";
    for(i= 0; i< N; i++){
        sum = sum + num;
    cout<<"Sum is: "<<sum;



Enter the Number of Integers to Add: 5
Enter 5 Numbers: 35
find sum of natural number in c++
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Path variable is set for providing path for all Java tools like java, javac, javap, javah, jar, appletviewer which are used in java programming. All these tools are available in bin folders so we set path upto bin folders.

Classpath variable is set for providing a path for predefined Java classes which is used in our application. All classes are available in lib/rt.jar so we set classpath upto lib/rt.jar.

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