write a progam to display the factors of a given number and
disply how many prime numbers are there?
Answers were Sorted based on User's Feedback
Answer / sreejesh1987
//This code displays prime factors only
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,n,x,flag=0,d,count=0;
clrscr();
printf("\tPRIME CHECK\n");
printf("Enter a no:");
scanf("%d",&n);
for(j=2;j<n,n%j!=0;j++)
if(n-1==j)
{
printf("\n\t%d is a prime",n);
flag=1;
}
if(!flag)
{
printf("\nNumber %d is not a prime",n);
printf("\nIts factors are:\n\t");
x=2;
while(n!=1)
{
while(n%x==0)
{
n=n/x;
printf("%d ",x);
count++;
}
x++;
}
printf("\nNumber of factors:%d",count);
}
getch();
}
Is This Answer Correct ? | 3 Yes | 1 No |
Answer / kracekumar
to check a number is prime or not ,it is enough to check till square root(floor) of the number is divisible or not.
#include<stdio.h>
#include<math.h>
/*
WHILE COMPILING IN LINUX USE gcc -lm -o factor factor.c and execute ./factor
*/
void isprime(int factor)
{
/*This function will check the given factor of the no is prime or not if so it will print the number factor as (prime)*/
int inner_loop,sqrt_of_factor;
sqrt_of_factor=(int)sqrt((double)factor);//in sqrt function will take float or double argument
if(factor==2)
printf("(prime)");
else
{/*To find out the no is prime or not you need to find out square root and from 2 to square root of the no if the no is not divisble by the no it is called as prime no*/
for(inner_loop=2;inner_loop<=sqrt_of_factor;++inner_loop)
{
if(factor%inner_loop==0)//if it divisble it exit the looop
break;
}
if(inner_loop>sqrt_of_factor)
/*best part is this checking ,if the no(factor) is prime it should be exited the loop with the loop variable value greater than condition varibale value */
printf("(prime)");
}
}
void factor(int no)
{
int start,no_by_2=no/2;
/*no_by_2 is used because factor of a no will be in the range 1 to half the number */
printf("\n factors of %d are %d",no,1);
for(start=2;start<no_by_2;++start)
{
if(no%start==0)
{
printf("\t %d",start);
isprime(start);//checking the factor is prime or not
}
}
printf("\t %d",no);
isprime(no);
}
int main()
{
system("clear");//work only in LINUX
int no;
printf("\n enter the integer no for which factor is to be found:");
scanf("%d",&no);
factor(no);
printf("\n \n=================================================\n");
return 0;
}
Is This Answer Correct ? | 1 Yes | 1 No |
What does void main () mean?
Can we declare function inside main?
how to write hello word without using semicolon at the end?
Given a single Linked list with lakhs of nodes and length unknown how do you optimally delete the nth element from the list?
What is the difference between macros and inline functions?
What is %g in c?
Place the #include statement must be written in the program?
What is meant by high-order and low-order bytes?
WHAT WILL BE OUTPUT OF BELOW CODE . . AND PLEASE EXPLAIN HOW IT COME .. #include<stdio.h> #include<conio.h> void main() { int k=20; printf("%d%d%d%d",k,k++,++k,k); getch(); }
design and implement a program that reads floating-points numbers in a sentinel-controlled loop until the user terminates the program by entering zero.your program should determinate and print the smallest,largest and average of the supplied numbers.
Input is "rama loves rajesh and rajesh Loves rama also and rajesh wear gloves and bloves" To print output is count the numbers of times repeted the word love without case sensitive.
Is it better to use malloc() or calloc()?