C + + functions

1. RAND ()//66970397 54599083
   • Use the rand () function to produce a random integer within 1-100: int num = rand ()% 100 + 1;
   • General: Rand ()% (b-a+1) + A; Represents a random integer between the a~b.
   • RAND () function prototype: int rand (void);
   • The header file required by the rand () function is:<stdlib.h>/<cstdlib>
   • The random number produced by Rand () is the same as the last time it is run, and to produce a different random number each time, you can use the Srand (seed) function to produce a random seed, which can produce different random numbers as the seed is different. You can also include the time.h header file, and then use Srand (Time (0)) to randomize the random number generator using the current times, which guarantees that a different sequence of random numbers can be obtained every two times, and that it requires the program to run two times longer than 1 seconds.

C + + functions