Identify Odd, Even & Prime

#include <stdio.h>

void main() {

int n;

int choice;

int sum=0,i=1;

printf("\nEnter number : ");

scanf("%d",&n);

printf("\n1 : sum of %d numbers",n);

printf("\n2 : product of %d numbers",n);

printf("\n3 : check number is even");

printf("\n4 : check number is odd");

printf("\n5 : check number is prime");

printf("\n6 : factors of %d",n);

printf("\nEnter your choice : ");

scanf("%d",&choice);

switch(choice)

{

case 1:

{

for(i=1;i<=n;i++)

{

sum=sum+i;

}

printf("\nSUM : %d",sum);

break;

}

case 2:

{

int product=1,i=1;

for(i=1;i<=n;i++)

{

product=product*i;

}

printf("\nPRODUCT : %d",product);

break;

}

case 3:

{

if(n%2==0)

{

printf("\n%d is even",n);

}

else

{

printf("\n%d is not even",n);

}

break;

}

case 4:

{

if(n%2==1)

{

printf("\n%d is odd",n);

}

else

{

printf("\n%d is not odd",n);

}

break;

}

case 5:

{

int count=0,i;

for(i=1;i<=n;i++)

{

if(n%i==0)

{

count=count+1;

}

}

if(count==2)

{

printf("\n%d is prime",n);

}

else

{

printf("\n%d is not prime",n);

}

break;

}

case 6:

{

int count=0,i;

printf("Factors of %d : ",n);

for(i=1;i<=n;i++)

{

if(n%i==0)

{

printf(" %d",i);

}

}

break;

}

}

}