Sum of Fibonacci Series in C

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Write a program to find the sum of the Fibonacci series in C language. Previously, we have written a C program for Fibonacci Series. In the Fibonacci series, the next element will be the sum of the previous two elements. The Fibonacci sequence is a series of numbers where a number is found by adding up the two numbers before it. Starting with 0 and 1, the sequence goes 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, and so forth. Written as a rule, the expression is Xn= Xn-1+ Xn-2

By definition, the first two numbers in the Fibonacci sequence are either 1 and 1, or 0 and 1, depending on the chosen starting point of the sequence, and each subsequent number is the sum of the previous two.

Sum of Fibonacci series in a range

#include<stdio.h>
int main()
{
   int a=0, b=1, range, c, sum=0;

   printf("Enter the range of Fibonacci series: ");
   scanf("%d",&range);

   printf("The fibonacci series is: \t");
   while( a <= range )
   {
      printf("%d\t",a);
      sum += a;
      c = a + b;
      a = b;
      b = c;
   }

   printf("\nTheir sum is = %d", sum);

   return 0;
}

Output for different test-cases:-

Enter the range of Fibonacci series: 20
The fibonacci series is: 0 1 1 2 3 5 8 13
Their sum is = 33

Enter the range of Fibonacci series: 50
The Fibonacci series is: 0 1 1 2 3 5 8 13 21 34
Their sum is = 88

Sum of first N terms of Fibonacci series in C

#include<stdio.h>
int main()
{
   int a=0, b=1, num, c, sum=0;

   printf("Enter number of terms: ");
   scanf("%d",&num);

   for(int i=0; i<num; i++)
   {
      sum += a;
      c = a + b; //next element
      a = b;
      b = c;
   }

   printf("Sum = %d", sum);

   return 0;
}

Output for different test-cases:-

Enter number of terms: 9
Sum = 54

See Also:-

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Flow Control
If-else Statement in C
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Switch Case in C
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While loop in C
Do-while loop in C
While vs do-while
For loop in C
Break keyword in C
Continue keyword in C
Break vs Exit in C
Goto keyword in C
☕️ Flow Control Programs
Largest among 3 Numbers
Find Grade of student
Find the absolute value
Check Vowel or Consonant
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Simple calculator in C
Check Odd or Even 
Roots of Quadratic Equation
Find Reverse of Number
Factors of a number in C
Generate Multiplication table
Find Power of a Number
Find GCD and LCM
Find factorial of Number
Count Number of Digits
Sum of digits in Number
Sum of N Natural Numbers
Sum of Squares of Natural No.
Find Sum of Odd Numbers
Find the Sum of Series
Find Fibonacci series in C
Sum of the Fibonacci series
Sum until enters +ve numbers
Sum of max 10 no. & Skip -ve
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