实验一

#include<stdio.h>
int main()
{
printf(" 0\n");
printf("<H>\n");
printf("I I\n");
printf(" 0\n");
printf("<H>\n");
printf("I I\n");
return 0;
}

int main()
{
    float a, b, c;
    scanf_s("%f%f%f", &a, &b, &c);
    if (a + b > c && a + c > b && b + c > a)

        printf("能构成三角形\n");
    
    else
        printf("不能构成三角形\n");
    return 0;
}

#include <stdio.h>
int main()
{
    char ans1, ans2; 
    printf("每次课前认真预习、课后及时复习了没? (输入y或Y表示有，输入n或N表示没有):");
        
    ans1 = getchar(); 
    getchar(); //多吃一个回车键
    printf("\n动手敲代码实践了没? (输入y或Y表示敲了，输入n或N表示木有敲) : ");
    ans2 = getchar();
    if ((ans1 == 'y' || ans1 == 'Y') && (ans2 == 'y' || ans2 == 'Y')) 
        printf("\n罗马不是一天建成的, 继续保持哦:)\n");
    else
        printf("\n罗马不是一天毁灭的, 我们来建设吧\n");
    return 0;
}

#include<stdio.h>
int main() 
{double x, y;
    char c1, c2, c3;
    int a1, a2, a3;
    scanf_s("%d%d%d", &a1, &a2, &a3);
    printf("a1 = %d,a2 = %d,a3 = %d\n", a1, a2, a3);

    scanf_s("%c%c%c", &c1, &c2, &c3);
    printf("c1 = %c,c2 = %c,c3 = %c\n", c1, c2, c3);

    scanf_s("%lf%lf", &x, &y);
    printf("x = %lf,y = %lf\n", x, y);


    return 0;

#include <stdio.h>
int main()
{
    int year;
    int t, m;
    int i = 1000000000;
    year = i / (60 * 60 * 24 * 365);
    t = year * 100;
    m = t % 100;
    if (m >= 50)
        year+= 1;
    else if (m < 50)
        year = year + 0;

    printf("10亿秒约等于%d年\n", year);
    return 0;
}

#include <stdio.h>
#include <math.h>
int main()
{
    double x, ans;
    scanf_s("%lf", &x);
    ans = pow(x, 365);
    printf("%.2f的365次方: %.2f\n", x, ans);
    return 0;
}

#include <stdio.h>
#include <math.h>
int main()
{
    double x, ans;
    while (scanf_s("%lf", &x) != EOF)
    {
        ans = pow(x, 365);
        printf("%.2f的365次方: %.2f\n", x, ans);
        printf("\n");
    }
    return 0;
}

#include <stdio.h>
#include <math.h>

int main()
{
    double c, f;

    while (scanf_s("%lf", &c))
    {
        f = 9 * c / 5 + 32;
        printf("摄氏度C=%.2lf时，华氏度f=%.2lf\n", c,f);
            printf("\n");
    }



    return 0;
}

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main()
{
    int a, b, c;
    double s;
    double area;
    
    while (scanf_s("%d%d%d", &a, &b, &c)!=EOF)
    {
        
        s = (a + b + c) / 2;
        area = sqrt(s * (s - a) * (s - b) * (s - c));
        printf("a=%d,b=%d,c=%d,area=%.3lf",a,b,c,area);
 }
    return 0;
}