In this article we will learn to implement a C program to print prime numbers up to n. A C program is provided below which accepts n as input from user and prints all the prime numbers up to n.
The program is as follows:
#include <stdio.h>
#include <conio.h>
#include <math.h>
int main()
{
int n;
printf("Enter n: ");
scanf("%d", &n);
printf("Prime numbers up to %d are: \n", n);
for(int i = 2; i < n; i++)
{
int flag = 0;
for(int j = 2; j <= sqrt((double)i); j++)
{
if(i % j == 0)
{
flag = 1;
break;
}
}
if(flag == 0)
printf("%d ", i);
}
getch();
return 0;
}
Input and output for the above program is as follows:
Enter n: 25
Prime numbers up to 25 are:
2 3 5 7 11 13 17 19 23
Suryateja Pericherla, at present is a Research Scholar (full-time Ph.D.) in the Dept. of Computer Science & Systems Engineering at Andhra University, Visakhapatnam. Previously worked as an Associate Professor in the Dept. of CSE at Vishnu Institute of Technology, India.
He has 11+ years of teaching experience and is an individual researcher whose research interests are Cloud Computing, Internet of Things, Computer Security, Network Security and Blockchain.
He is a member of professional societies like IEEE, ACM, CSI and ISCA. He published several research papers which are indexed by SCIE, WoS, Scopus, Springer and others.
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