Program for Sum of Prime Numbers

January 31, 2023

Sum of Prime Numbers

We will write a C program sum of prime numbers and the number will be entered by the user. This will help to understand the basic structure of programming. In this program , we will display the calculation of sum of prime numbers easily by using proper syntax and algorithms.

Program for Sum of Prime Numbers

Working of Program :

In the program, we will require some numbers from the user to display the calculation of sum of prime numbers.

Important Note :

  • The number is a prime number which is greater than 1 and that is not a product of two smaller natural numbers
  • The number which is divisible by one and itself also referred to as prime number.

Syntax for For() Loop:-

for(Initialization,Condition,Increment / Decrement)
{
    // Statements 
}

Problem 1

Write a program to calculate the sum of all prime number between 1 to n using for loop.

  • Firstly, we have to enter the number.
  • Then print the sum of prime numbers between 1 to n.

Code

Run 
#include<stdio.h> 
int main()
{
    int val =17;
    for(int i=2; i < val; i++)
    {
        if(val%i ==0)
        {
            printf("Given Number %d is not prime number", val);
            return 0;
        }
    }
    printf("Given Number %d is a Prime Number", val);
    return 0;
}

Output

Given Number 17 is a Prime Number
C tutorial desk gif

Program to source code output

Program to sum natural numbers

Program for structure store information

Program to string length

Program for string copy

Note:

In the following program we will display the calculation of sum of prime number using while() loop.

Syntax for while() Loop:-

while(condition)
{
    // Statements
    // Increment / Decrement
}

Problem 2

Write a program to calculate the sum of prime number between 1 to n using while loop.

  • Firstly, we have to enter the number.
  • Then print the sum of prime numbers.

Code

Run 
#include<stdio.h>
int main()
{
    int val = 21, i=2;
    while(i * i < val) 
    {
        if(val%i ==0)
        {
            printf("Given Number %d is not prime number", val);
            return 0;
        }
        i++;
    }
    printf("Given Number %d is a Prime Number", val);
    return 0;
}

Output

Given Number 21 is not prime number

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