Sum of Series Program in C

Flow Control
If-else Statement in C
Programs on if-else
Switch Case in C
Switch case Programs
Conditional Operator
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 in 3 Numbers
Find Grade of student
Find the absolute value
Vowel or Consonant
Leap Year Program
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
☕️ C Conversion Programs
Celsius to Fahrenheit
Fahrenheit to Celsius
Decimal ↔ Binary
Decimal ↔ Octal
Octal ↔ Binary in C
☕️ Number Programs in C
Prime Number in C
Strong Number in C
Krishnamurthy Number
Neon Number in C
Palindrome number
Perfect Number in C
Armstrong Number
☕️ Pattern Programs in C
Pattern programs in C
Printing pattern using loops
Floyd’s triangle Program
Pascal Triangle Program
Pyramid Star Pattern in C
Diamond Pattern Programs
Half Diamond pattern in C
Print Diamond Pattern
Hollow Diamond Pattern
Diamond Pattern of Numbers

In this tutorial we will write sum of series program in C language. Some series as 1+2+3+4+5+…+n, 1 + 1/2 + 1/3 + 1/4 + 1/5 + 1/6 +……+ 1/n and 1 + 1/(2*2) + 1/(3*3) + 1/(4*4) + ….. + 1/(n*n)

Table Of Contents


Sum of series in C 1+2+3+4+5+..+N

Program Description:- Display sum of series 1+2+3+4+5+..+n = ?

Sample Input Output-1:-

Enter n value: 5
1+2+3+4+5=15

Sample Input Output-2:-

Enter n value: 15
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15=120

#include<stdio.h>
int main()
{
   int n, sum=0;

   printf("Enter n value: ");
   scanf("%d",&n);

   for(int i=1; i<=n; i++)
   {
     printf("%d+",i);
     sum += i; //sum = sum + i;
   }

   printf("\b=%d",sum);

   return 0;
}

In this program ‘\b’ character used to remove last ‘+’ character. If we don’t use ‘\b’ then for n=5 we will get below output,

Enter n value: 5
1+2+3+4+5+=15

Enter n value: 10
1+2+3+4+5+6+7+8+9+10=55

Sum of series in C language 1² + 2² + 3² + 4² + 5² +….+ n²

Program description:- Find sum of series 1² + 2² + 3² + 4² + 5² +….+ n² = ?

Sample Input Output 1

Enter n value: 5
Sum = 55

Sample Input Output 2

Enter n value: 12
Sum=650

#include<stdio.h>
int main()
{
   int n, sum=0;

   printf("Enter n value: ");
   scanf("%d",&n);

   for(int i=1; i<=n; i++)
   {
     sum += i*i; //sum = sum + (i*i);
   }

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

   return 0;
}

Enter n value: 7
Sum = 140

Sum of series 1 + 1/2 + 1/3 + 1/4 + 1/5 + 1/6 +……+ 1/n

Using For Loop

#include<stdio.h>
int main()
{
     int n,i;
     float sum=0.0;

     printf("Enter the limit (n Value): ");
     scanf("%d",&n);

     for(i=1;i<=n;i++)
     {
         sum+=(1.0/i); //sum = sum + 1.0/i
     }

     printf("Sum = %f\n", sum);

     return 0;
}

1 + 1/2 + 1/3 + 1/4 + 1/5 + 1/6 +……+ 1/n using While Loop

#include<stdio.h>
int main()
{
     int n, i=1;
     float sum=0.0;

     printf("Enter the limit (n Value): ");
     scanf("%d",&n);

     while(i<=n)
     {
         sum+=(1.0/i); //sum = sum + 1.0/i
         i++;
     }

     printf("Sum = %f\n", sum);

     return 0;
}

Output:-

Enter the limit (n Value): 50
Sum = 4.499206

1 + 1/(2*2) + 1/(3*3) + 1/(4*4) + ….. + 1/(n*n)

Using For Loop

#include<stdio.h>
int main()
{
     int n,i;
     float sum=0.0;

     printf("Enter the limit (n Value): ");
     scanf("%d",&n);

     for(i=1;i<=n;i++)
     {
         sum+=(1.0/(i*i)); // sum = sum + (1.0 / (i*i) )
     }

     printf("Sum = %f", sum);
     return 0;
}

1 + 1/(2*2) + 1/(3*3) + 1/(4*4) + ….. + 1/(n*n) using While Loop

#include<stdio.h>
int main()
{
   int n, i=1;
   float sum=0.0;

   printf("Enter the limit (n Value): ");
   scanf("%d",&n);

   while(i<=n)
   {
       sum+=(1.0/(i*i)); // sum = sum + (1.0 / (i*i) )
       i++;
   }

   printf("Sum = %f\n", sum);

   return 0;
}

Sum of series in C language 1 + 1/(2*2) + 1/(3*3) + 1/(4*4) + ….. + 1/(n*n) using pow() Function

Using pow() function, we can use either while loop or for loop. Here, while loop is used. You can also use for loop instead of while loop.

#include<stdio.h>
#include<math.h>
int main()
{
     int n, i=1;
     float sum=0.0;

     printf("Enter the limit (n Value): ");
     scanf("%d",&n);

     while(i<=n)
     {
         sum+=(1.0/pow(i,2)); //sum = sum + 1.0/ pow(i,2)
         i++;
     }

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

     return 0;
}

Output:-

Enter the limit (n Value): 50
Sum = 1.625133

In this sum of series in C language program, If you are using Linux/Unix OS and getting an error then read it “undefined reference to sqrt (or other mathematical functions)” even include math.h header

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Flow Control
If-else Statement in C
Programs on if-else
Switch Case in C
Switch case Programs
Conditional Operator
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
Leap Year Program
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
☕️ C Conversion Programs
Celsius to Fahrenheit
Fahrenheit to Celsius
Decimal ↔ Binary
Decimal ↔ Octal
Octal ↔ Binary in C
☕️ Number Programs in C
Prime Number in C
Strong Number in C
Krishnamurthy Number
Neon Number in C
Palindrome number
Perfect Number in C
Armstrong Number
☕️ Pattern Programs in C
Pattern programs in C
Printing pattern using loops
Floyd’s triangle Program
Pascal Triangle Program
Pyramid Star Pattern in C
Diamond Pattern Programs
Half Diamond pattern in C
Print Diamond Pattern
Hollow Diamond Pattern
Diamond Pattern of Numbers

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