#include<stdio.h> #include<math.h> void main() { float n, v1, v2, t; while (scanf("%f %f %f %f",&n,&v1,&v2,&t)!=EOF) { float s; if (n == 0) printf("0.00\n"); if (v1 >= 0 && v2 >= 0) { if (v2 >= v1)printf("No\n"); else if ((v1 - v2)*t < n * 1000) printf("No\n"); else { s = (n * 1000) / (v1 - v2); printf("%.2f\n", s); } } else if (v1 < 0 && v2 < 0) { if (fabs(v1) >= fabs(v2))printf("No\n"); else if ((fabs(v1) - fabs(v2))*t < n * 1000) printf("No\n"); else { s = (n * 1000) / (fabs(v1) - fabs(v2)); printf("%.2f\n", s); } } else if (v1 > 0 && v2 < 0) { if ((v1 + fabs(v2))*t < n * 1000) printf("No\n"); else { s = (n * 1000) / (v1 + fabs(v2)); printf("%.2f\n", s); } } else if(v1<0&&v2>0) { printf("No\n"); } } } |
Double click to view unformatted code.