產生隨機機率的c方法

問題

1>0～5％2>5%~60%3>60%~100%

用rand（）產生機率

c實現

#include <stdio.h>#include <time.h>#include <stdlib.h>// before use this srand must be invoked.// probs must be ascending order and all of them should not greater than 1.// n is the number of probs.// returns the index of probs that the random result falls.int random_section(float probs[], int n) {    double r = (float)rand()/RAND_MAX;    int i;    for (i = 0; i < n; i++) {        if (r < probs[i]) {            return i;        }    }    return n;}int main() {    srand((int)time(0));    float ps[] = {0.05, 0.6, 1};    int i;    int count[4] = {0};    for (i = 0; i < 100000; i++) {        int p = random_section(ps, 3);        count[p]++;    }    for (i = 0; i < 4; i++) {        printf("count[%d]=%d\n", i, count[i]);    }    return 0;}