uva 10341 Solve It（二分搜尋）

題目串連：10341 Solve It

題目大意：根據給出的數學公式，在[0，1]上求解。

解題思路：二分搜尋， 主要注意一下邊界和精度就可以了。

#include <stdio.h>#include <string.h>#include <math.h>#include <stdlib.h>double p, q, r, s, t, u, cur;double count(double x) {    return p * exp(-x)  + q * sin(x) + r * cos(x) + s * tan(x) + t * x * x + u;}int main() {    while (scanf("%lf%lf%lf%lf%lf%lf", &p, &q, &r, &s, &t, &u) == 6) {double a = 0, b = 1;if (count(a) * count(b) > 0)    printf("No solution\n");else if (fabs(count(0)) <= 0.0001)    printf("0.0000\n");else if (fabs(count(1)) <= 0.0001)    printf("1.0000\n");else {    if (count(0) > 0) {a = 1;b = 0;    }    else {a = 0;b = 1;    }    while (1) {cur = (a + b) / 2;if (fabs(count(cur)) <= 0.00000001)    break;else if(count(cur) > 0)    b = cur;else    a = cur;    }    printf("%.4lf\n", cur);}    }    return 0;}