About Lesson
for( ; ; )
{
…
…..
….
break; ——
….. _
….. –
} – Break transfer the control outside the loop
…. – cause of break become un natural death of loop
…. <——- emergency exit from loop
1. enter a number check is it prime or not
C
#include<stdio.h>
#include<conio.h>
void main()
{
int num,i;
clrscr();
printf("\nenter a number");
scanf("%d",&num); // 5, 9
for(i=2;i<num;i++) // 2<5=>t, 3<5, 4<5, 5<5=>f | 2<9=>t, 3
{
if(num%i==0) //5%2==0=>F, 5%3==0=>F, 5%4==0=>F | 9%2=>1==0>F, 9%3=>0==0=>T
{
break;
}
}
if(i==num) //5==5, 3==9
{
printf("\n%d is prime number",num);
}
else
{
printf("\n%d is not prime number",num);
}
getch();
}
/*
Print all prime numbers upto 100
*/