不会，求解答c语言题目

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
int main()
{
    srand(time(NULL));
    int count = 0,a,b;
    for(int i=0;i<10000;i++)
    {
        a = rand()%6+1;
        b = rand()%6+1;
        if(a+b == 7)
            count++;
    }
    printf("%.2f%%",count/100.0);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
    int a,b,i;
    int cnt = 0;
    srand((unsigned int)time(NULL));
    for (i=0;i<10000;i++)
    {
        a = rand()%6+1;
        b = rand()%6+1;
        if(a+b==7)
            cnt++;
    }
    printf("概率：%d%%",100*cnt/10000);
    return 0;
}