Find the Sum of Numbers in a Given Range in C Program using For loop | Formula | while loop | do-while loop | Function | Recursion

Find the sum of numbers in a given range in c program.

In this article, you will learn how to make the sum of the range of a given input number by using various approaches like - standard formula, for loop, while loop, do-while loop, function, and recursion.

The range of input numbers can be negative or positive.

 

Example-1

 

Example-2

 

You should know about the following topics in C programming to understand this program:

• For loop in C
• While loop in C
• Do-while loop in C
• C Function
• C Recursion

 

1 - Sum of Numbers in a Given Range in C using For loop

// Sum of Numbers in a Given Range in C using For loop
#include <stdio.h>

// It's the main function of the program
int main()
{
    int range_start, range_end, sum = 0;

    // Step-1 Take input from the User
    printf("Start Range: ");
    scanf("%d", &range_start);

    printf("End Range: ");
    scanf("%d", &range_end);

    // Step-2 Use a loop from the start range to the end range to get the values & make the sum of each value
    for (int i = range_start; i <= range_end; i++)
    {
        sum += i;
    }

    // Step-3 Final output of the program
    printf("Total Sum: %d", sum);
    return 0;
}

Run

Output

 

2 - Sum of Numbers in a Given Range in C using Standard Formula

// Sum of Numbers in a Given Range in C using Standard Formula
#include <stdio.h>

// It's the main function of the program
int main()
{
    int range_start, range_end;

    // Step-1 Take input from the User
    printf("Start Range: ");
    scanf("%d", &range_start);

    printf("End Range: ");
    scanf("%d", &range_end);

    // Step-2 Use the standard formula to make sum of the given range
    int sum = range_end * (range_end + 1) / 2 - range_start * (range_start + 1) / 2 + range_start;

    // Step-3 Final output of the program
    printf("Total Sum: %d", sum);
    return 0;
}

Run

Output

 

3 - Sum of Numbers in a Given Range in C using While loop

// Sum of Numbers in a Given Range in C using While loop
#include <stdio.h>

// It's the main function of the program
int main()
{
    int range_start, range_end, sum = 0;

    // Step-1 Take input from the User
    printf("Start Range: ");
    scanf("%d", &range_start);

    printf("End Range: ");
    scanf("%d", &range_end);

    // Step-2 Use a loop from the start range to the end range to get the values & make the sum of each value
    while (range_start <= range_end)
    {
        sum += range_start;
        range_start++;
    }

    // Step-3 Final output of the program
    printf("Total Sum: %d", sum);
    return 0;
}

Run

Output

 

4 - Sum of Numbers in a Given Range in C using Do-while loop

// Sum of Numbers in a Given Range in C using Do-while loop
#include <stdio.h>

// It's the main function of the program
int main()
{
    int range_start, range_end, sum = 0;

    // Step-1 Take input from the User
    printf("Start Range: ");
    scanf("%d", &range_start);

    printf("End Range: ");
    scanf("%d", &range_end);

    // Step-2 Use a loop from the start range to the end range to get the values & make the sum of each value
    do
    {
        sum += range_start;
        range_start++;
    } while (range_start <= range_end);

    // Step-3 Final output of the program
    printf("Total Sum: %d", sum);
    return 0;
}

Run

 

5 - Sum of Numbers in a Given Range in C using Function

// Sum of Numbers in a Given Range in C using Function
#include <stdio.h>

// Function to make sum of given range number
int sum_of_range(int range_start, int range_end)
{
    int sum = 0;

    // Use a loop from the start range to the end range to get the values & make the sum of each value
    while (range_start <= range_end)
    {
        sum += range_start;
        range_start++;
    }
    return sum;
}

// It's the main function of the program
int main()
{
    int range_start, range_end, sum = 0;

    // Step-1 Take input from the User
    printf("Start Range: ");
    scanf("%d", &range_start);

    printf("End Range: ");
    scanf("%d", &range_end);

    // Step-3 Call the sum_of_range() function to get the sum of the input range number
    printf("Total Sum: %d", sum_of_range(range_start, range_end));
    return 0;
}

Run

Output

 

6 - Sum of Numbers in a Given Range in C using Recursion

// Sum of Numbers in a Given Range in C using Recursion
#include <stdio.h>

// Function to make the sum of given range number
int rec_sum_of_range(int range_start, int range_end, int sum)
{
    sum += range_start;
    range_start++;

    if (range_start < range_end)
        rec_sum_of_range(range_start, range_end, sum);
    else
        return sum + range_start;
}

// It's the main function of the program
int main()
{
    int range_start, range_end, sum = 0;

    // Step-1 Take input from the User
    printf("Start Range: ");
    scanf("%d", &range_start);

    printf("End Range: ");
    scanf("%d", &range_end);

    // Step-3 Call the recursive function rec_sum_of_range() to get the sum of the input range number
    printf("Total Sum: %d", rec_sum_of_range(range_start, range_end, sum));
    return 0;
}

Run