问题
I would like to be able to generate a random number from a group of numbers, like for example: 1, 2, 3, 12, 11, 23, 45, 54, 10, 10, 12, 23, 35, 24. Using the rand and the srand i can generate random numbers different each time but i would like to able to condition the outcomes by generating random numbers from a group.
回答1:
Example code
Take an Array
int a[]={ 1, 2, 3, 12, 11, 23, 45, 54, 10, 10, 12, 23, 35, 24};
int i = rand()%14; // here 14 is number of element in array.
i will receive a value between 0 to 13
At last
printf("%d",a[i]); //print that array index
来源：https://stackoverflow.com/questions/26927978/how-can-i-generate-a-random-number-from-a-group-of-numbers-not-a-range