View Code of Problem 104

#include <stdio.h>
#include <stdlib.h>
#include<ctype.h>
#include<string.h>
#include<math.h>
#include<stdbool.h>
int main()
{
	float i, j, va, vb, a, b, n, t;
	float s, shi;
	while (scanf("%f%f%f%f", &n, &va, &vb, &t)!=EOF)
	{
		if (n == 0)
			printf("0.00\n");
		else
		{
			if (vb >= va)
				printf("NO\n");
			else
			{
				shi = n * 1000 / (va-vb);
				if (shi <= t)
					printf("%.2f\n", shi);
				else printf("NO\n");
			}
			
			
		}
	}

	return 0;
}