count number of prime numbers in a given range in c

krishnaa s answered on May 27, 2022 Popularity 8/10 Helpfulness 3/10

answer count number of prime numbers in a given range in c

related how to code how to count prime numbers from a range in c

count number of prime numbers in a given range in c

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#include <iostream>
using namespace std;
int main()
{
    int n1=0,n2=100,count=0;
    for(int i=n1;i<=n2;i++)
    {
        int c=0;
        for(int j=1;j<=i;j++)
        {
            if(i%j==0)
            {
                c++;
            }
        }
        if(c==2)
        {
            count++;
        }
    }
    cout<<count;
    return 0;
}

Popularity 8/10 Helpfulness 3/10 Language cpp

Source: Grepper

Tags: c c++ count numbers range

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Contributed on May 27 2022

krishnaa s

0 Answers Avg Quality 2/10

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how to code how to count prime numbers from a range in c

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#include<stdio.h>
#include<math.h>
int main() {
	int i,n,flag,c;
	int l,r;
	
	printf("Enter Lower Limit, L: ");
	scanf("%d",&l);
	printf("Enter Upper Limit, R: ");
	scanf("%d",&r);
	
	c = 0; // counter
	// iterating all numbers from l to r
	// and checking if they are prime or not
	for(n = l;n<=r;++n){
		
		// 1 is not prime
		if(n==1)
			continue;
		
		// checking if n is prime or not
		flag = 0;
		for(i = 2;i<=sqrt(n);++i){
			// if i divies n then it means n is not prime
			// flag = 1 denotes that there exist a number
			// between 2 and sqrt(n) that divides n
			if(n%i==0){
				flag=1;
				break;
			}
		}
		
		// flag = 0 implies no number divides n
		// thus, n is prime
		if(flag==0)
			++c;
			
	}
	
	printf("Number of Prime numbers between %d and %d are: %d\n",l,r,c);
	
}

Popularity 3/10 Helpfulness 1/10 Language c

Source: slaystudy.com

Tags: numbers c range count

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Contributed on Oct 28 2023

ruben

0 Answers Avg Quality 2/10

count number of prime numbers in a given range in c

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count number of prime numbers in a given range in c

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how to code how to count prime numbers from a range in c

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