猜数：首先生成一个介于1-100之间的整数，从键盘不断输入数值直到该数值与生成的那个数相符为止，并打印出猜数的次数。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

void create_secret(int *c)
{
srand(time(NULL));
*c = rand()%100 + 1;
}

void guess(int n)
{
int inputnumber, times = 1;

while(1){
printf("enter a number:\n");
scanf("%d", &inputnumber);
if(inputnumber == n){
printf("Get it by %d\n", times);
break;
}

if(inputnumber > n){
printf("too high\n");
}
else{
printf("too low\n");
}
times++;

}

}

int main(void)
{
int n;
create_secret(&n);
guess(n);
return 0;
}

/*

enter a number:
66
too high
enter a number:
55
too high
enter a number:
30
too low
enter a number:
40
too high
enter a number:
36
too high
enter a number:
32
too low
enter a number:
33
Get it by 7

*/