write a progam to display the factors of a given number and
disply how many prime numbers are there?
Answer Posted / 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 |
Post New Answer View All Answers
Why void is used in c?
What is the difference between int main and void main?
How to explain the final year project as a fresher please answer with sample project
c language supports bitwise operations, why a) 'c' language is system oriented b) 'c' language is problem oriented c) 'c' language is middle level language d) all the above
Is it possible to initialize a variable at the time it was declared?
Differentiate between a for loop and a while loop? What are it uses?
What are c preprocessors?
i want to know the procedure of qualcomm for getting a job through offcampus
What is main () in c?
What is output redirection?
Explain the term printf() and scanf() used in c language?
Why static variable is used in c?
What is #include called?
What is LINKED LIST? How can you access the last element in a linked list?
Why is c used in embedded systems?