Program for print first n prime numbers in C

Program for print first n prime numbers in C

In this article, we will discuss the concept of Program for print first n prime numbers in C

In this code, we are going to learn how to find first n prime numbers  using different methods in C language.

This is done using for loop,while loop and ,do-while loop in C language

Code to display first n prime numbers

Code to display first n prime numbers using for loop

In this program, we will display first n  prime numbers using for loop in C language

Program 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n,i=3,count,num;
    printf("Enter the number of prime you want\n");
    //ask input from the user and store in n
    scanf("%d",&n);

    if(n>=1){
        printf("First %d prime numbers are: \n",n);
        printf("2\n");
    }
    for(count=2; count<=n; i++){
        for(num=2; num<i; num++){
            if(i%num==0)
                break;
        }
        if(num==i){
            printf("%d  ",i);
            count++;
        }
    }
    return 0;
}

When the above code is executed, it produces the following results

Enter the number of prime you want
15
First 15 prime numbers are :
2  3  5  7  11  13  17  19  23  29  31  37  41  43  47

 

Code to display first n prime numbers using while loop

In this program, we will display first n  prime numbers using while loop in C language

Program 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n,i=3,count,num;
    printf("Enter the number of prime you want\n");
    //ask input from the user and store in n
    scanf("%d",&n);

    if(n>=1){
        printf("First %d prime numbers are: \n\n",n);
        printf("2 ");
    }
    count=2;
    while(count<=n){
            num=2;
        while(num<i){
            if(i%num==0)
                break;
     num++;
        }
        if(num==i){
            printf("%d ",i);
            count++;
        }
         i++;
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results

Enter the number of prime you want
10
First 10 prime numbers are :
2  3  5  7  11  13  17  19  23  29

 

Code to display first n prime numbers using do-while loop

In this program, we will display first n  prime numbers using do-while loop in C language

Program 3

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n,i=3,count,num;
    printf("Enter the number of prime you want\n");
    //ask input from the user and store in n
    scanf("%d",&n);

    if(n>=1){
        printf("First %d prime numbers are: \n\n",n);
        printf("2 ");
    }
    count=2;
    do{
            num=2;
        do{
            if(i%num==0)
                break;
     num++;
        }while(num<i);
        if(num==i){
            printf("%d ",i);
            count++;
        }
         i++;
    }while(count<=n);
    getch();
    return 0;
}

When the above code is executed, it produces the following results

Enter the number of prime you want
8
First 8 prime numbers are :
2  3  5  7  11  13  17  19

 

Suggested post

for loop in C language

while loop in C language

do-while loop in C language

if statements in C language

function in C language

 

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