c/c++随机数

 

<stdlib.h> 

int rand (void);

//伪随机数

#include <stdio.h>
#include <stdlib.h>
int main(){
int a = rand();
printf("%d\n",a);
return 0;
}



///////////////////////////////////////

//真随机数

void srand (unsigned int seed);

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() {
    int a;
    srand((unsigned)time(NULL));
    a = rand();
    printf("%d\n", a);
    return 0;
}