Question

1. You are to write a program in C to do the following in a loop for the KL46Z .
   • Prompt the user for a positive integer greater than 1 and sanity-check the input.
   • If the number is a prime number, it is to be printed on a new line in red text.
   • If the number is evenly divisible by 7, it is to be printed on a new line in green text.
   • If the current number is evenly divisible by the last number entered, it is to be printed on a new line in blue.
   • If the least significant digit of the number is 3, the number is to be printed on a new line underlined.

If none of the above conditions are met, simply print a blank new line

Answer 1

#include<stdio.h>
#include<math.h>
int prime(int x)
{
   if(x<2)return 0;
   if(x==2)return 1;
   for(int i=2;i<=sqrt(x);i++)
   {if(x%i==0)return 0;
   }
   return 1;
}
int main()
{int b=-1;
   while(1)
   {
       int a;
       printf("enter number ");//enter -1 for break
       scanf("%d",&a);

if(a==-1)break;
       if(prime(a))
       {
       printf("\033[1;31m");//convert next written statment as red
       printf("%d\n",a);
       printf("\033[0m");//reset
       }
       else if(a%7==0&&(a/7)%2==0)
       {
       printf("\033[1;32m");//convert next written statment as green
       printf("%d\n",a);
       printf("\033[0m");//reset
       }
       else if(b!=-1&&a%b==0&&(a/b)%2==0)
       {
       printf("\033[1;34m");//convert next written statment as blue
       printf("%d\n",a);
       printf("\033[0m");//reset
       }
       else if(a%10==3)
       {printf("\033[4m");//convert next written statment as underlined
       printf("%d\n",a);
       printf("\033[0m");//reset
       }
       else
       printf("\n");
       b=a;
   }
}

input ;- this is coloured check on your terminal

enter number 2   
^₂
enter number 14
14
enter number 28
28
enter number 7
7
enter number 5
5
enter number 10
10
enter number 33
33
enter number
1

enter number