# Program for Sum of Prime Numbers

## 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. ## 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
```

### 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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