C Programming Code Examples
C > For Loops and While Loops Code Examples
print prime numbers in given range
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/* print prime numbers in given range
Write a C program to print all Prime numbers between 1 to n using loop. How to print all prime numbers between given interval using loop in C program. Logic to print prime numbers in a given range in C program.
C program to print all prime numbers between 1 to n */
#include <stdio.h>
int main()
{
int x, j, start, end;
int isPrime;
/* Input upper and lower limit to print prime */
printf("Enter lower limit: ");
scanf("%d", &start);
printf("Enter upper limit: ");
scanf("%d", &end);
printf("All prime numbers between %d to %d are:\n", start, end);
// Make sure that lowerlimit does not go below 2
// Since 2 is first prime number
if(start < 2)
start = 2;
/* Find all Prime numbers between 1 to n */
for(x=start; x<=end; x++)
{
/* Assume that the current number is Prime */
isPrime = 1;
/* Check if the current number x is prime or not */
for(j=2; j<=x/2; j++)
{
/* If x is divisible by any number other than 1 and self then it is not prime number */
if(x%j==0)
{
isPrime = 0;
break;
}
}
/* If the number is prime then print */
if(isPrime==1)
{
printf("%d, ", x);
}
}
return 0;
}
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