C++ (Cpp) ifprime Examples

Example #1

File: Prime Palindromes.c Project: Rolight/ACM_ICPC

void nummaker(int now,int n)
{
	if(flag) return;
	if(((n & 1) == 1) && (now == n / 2 + 2))
	{
		int ans = combine(n);
		if(ifprime(ans) && ifin(ans))
			fprintf(out,"%d\n",ans);
		return;
	}
	if(((n & 1) == 0) && (now == n / 2 + 1))
	{
		int ans = combine(n);
		if(ifprime(ans) && ifin(ans))
			fprintf(out,"%d\n",ans);
		return;
	}
	int i;
	for(i = 0;i <= 9;i++)
	{
		if(now == 1)
			if(i == 0 || ((i & 1) == 0))
				continue;
		num[now] = i;
		num[n - now + 1] = i;
		nummaker(now + 1,n);
	}
}

Example #2

File: 7.c Project: gosour/euler

int main()
{
	int rank,i=2,j,count=0,temproot,flag;
	
//	printf("Enter the rank: ");
//	scanf("%d",&rank);
	rank=10001;
	
	while(1)
	{
		if(ifprime(i))
		{
			count++;
			if(count==rank)
			{
				printf("%d\n",i);
				break;
			}
		}
	
		if(i==2)
			i++;
		else
			i+=2;
	}
}		

Example #3

File: 5.c Project: gosour/euler

int main()
{
	int n,result=1,i,count;
	
	printf("Enter the number\n");
	scanf("%d",&n);
	
	for(i=2;i<=n;i++)
	{
		if(!ifprime(i))
			continue;
										
		count=1;
		while( (test=(int)pow(i,count)) <=n  )
			count++;
			
		result*=(int)pow(i,count-1);
	}
	
	printf("%d\n",result);
	return 0;
}