The algorithm needs to be noted that the generation of the second number is required to be specially processed. The following programs are tested under the VC . Net:
#include
/// randomly generate three numbers (must be 1 ~ 9), they are equal to a certain number (range is 14 ~ 19). // The first parameter is these three numbers and (ranges 14 ~ 19) // second parameters to output the generated random number // void getrandom (int sum, int * number {int TEMP;
SRAND (NULL);
// Generate a random number NUM [0] = 1 rand ()% 8;
/ / Then get the resulting range of the next number TEMP = Sum - Num [0];
IF (Temp == 18) {Num [1] = NUM [2] = 9;} else if (Temp> 9) {// If Temp> 9, in order to ensure NUM [2] <= 9, you must let Num [ 1] Between TEMP-9 to 9. NUM [1] = (Temp - 9) rand ()% (18-TEMP);} else {// If Temp <9, in order to ensure NUM [2]> = 1, you must let Num [1] in 1 to TEMP-1 between. NUM [1] = 1 rand ()% (Temp - 1);
Num [2] = Temp - Num [1];
Void main (void) {Int Num [3] = {0, 0, 0};
Getrandom (14, NUM);
Printf ("1st Number:% D / N", NUM [0]); Printf ("2nd Number:% D / N", NUM [1]); Printf ("3rd Number:% D / N", NUM [ 2]);}
