二

#include <stdio.h>

int main()
{
int i, j, k, m;
printf("input n:");
scanf_s("%d", &i);

for (j = i; j >= 0; j--)
{
for (k = 0; k < i - j; k++)
printf(" ");
for (k = 2 * j - 1; k > 0; k--)
{
printf(" o ");
while (k == 1)
{
printf("\n");
k--;
}
}
for (k = 0; k < i - j; k++)
printf(" ");
for (k = 2 * j - 1; k > 0; k--)
{
printf("<H> ");
while (k == 1)
{
printf("\n");
k--;
}
}
for (k = 0; k < i - j; k++)
printf(" ");
for (k = 2 * j - 1; k > 0; k--)
{
printf("I I ");
while (k == 1)
{
printf("\n");
k--;
}
}
}
return 0;
}

#include <stdio.h>

int main()
{
int line, col, i;
for (line = 1; line < 10; line++)
{
for (col = 1; col <= line; col++)
{
i = line * col;
printf("%d X %d = %d ", line, col, i);
}
printf("\n");
}
return 0;
}

 

 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
int n, k, i;
srand(time(0));
k = rand() % 30 + 1;
for (i = 0; i < 3; i++)
{
scanf_s("%d", &n);

if (n < k)
{
printf(" 猜早了\n");

}
else if (n > k)
{
printf("猜晚了\n");
}
else if (n = k)
{
printf("猜对了\n");
return 0;
}
}
if (i == 3)
{
printf("幸运日是%d", k);
}
return 0;

红绿灯

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
char n;
while (scanf_s("%c", &n) != EOF)
{
if (n == 'g')
printf("gogogo\n");
else if (n == 'r')
printf("stop\n");
else if (n == 'y')
printf("wait a minute\n");
else printf("error\n");
scanf_s("%c", &n);
}
return 0;

}

#include<stdio.h>
#include<math.h>
int main()
{
double s = 0.0, k = 0.0;
int i, a, n;
while(scanf_s("%d %d", &n, &a)!=EOF)
{
for (i = 1; i <= n; i++)
{
k = k * 10 + a;
s += i / k;
}
printf("%lf", s);
}
return 0;
}

计算