C program to make prime numbers or check prime numbers

C Programming C Programming Code Example

C program to make prime numbers or check prime numbers

Problem 1:
Write a  C program to check if the number is prime or not.
Solution:
logic for being a prime number:
C program to make prime numbers or check prime numbers
C Code for check if the number is prime or not:

#include <stdio.h>
int main()
{
int n, c = 2;

printf("Enter a number to check if it is prime = n");
scanf("%d",&n);

for ( c = 2 ; c <= n - 1 ; c++ )
{
if ( n%c == 0 )
{
printf("%d is not prime.n", n);
break;
}
}
if ( c == n )
printf("%d is prime.n", n);

return 0;
}
Run Code for check if the number is prime or not in Live [Give input 12 or 19 to check]:
Problem 2:
Write a  C program to generate number of prime numbers.
C code for generate number of prime numbers:

#include <stdio.h>
int main()
{
int n, i = 3, count, c;

printf("Enter the number of prime numbers requiredn");
scanf("%d",&n);

if ( n >= 1 )
{
printf("First %d prime numbers are :n",n);
printf("2n");
}

for ( count = 2 ; count <= n ; )
{
for ( c = 2 ; c <= i - 1 ; c++ )
{
if ( i%c == 0 )
break;
}
if ( c == i )
{
printf("%dn",i);
count++;
}
i++;
}

return 0;
}

Tags:
C program to make prime numbers or check prime numbers, C program to generate prime, prime number generating, C code,  c programming examples, c codes, prime number algorithm

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