实验一

任务一
#include <stdio.h> int main() { printf(" O \n"); printf("<H>\n"); printf("I I\n"); printf(" O \n"); printf("<H>\n"); printf("I I\n"); return 0; }

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

任务二
#include <stdio.h> int main() { double a, b, c; scanf_s("%lf%lf%lf", &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"); } getchar(); return 0; }

任务三
`#include <stdio.h>
int main() {
char ans1, ans2; // 用于保存用户输入的答案

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(); // 从键盘输入一个字符，赋值给ans1

getchar(); // 用于吸收输入ans1后残留的换行符

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");
}
getchar();
return 0;
}`

任务四
`#include<stdio.h>
int main() {
double x, y;
char c1, c2, c3;
int a1, a2, a3;

scanf("%d%d%d", &a1, &a2, &a3);
printf("a1 = %d, a2 = %d, a3 = %d\n", a1, a2, a3);

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

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

getchar();
return 0;
}`

任务五
`#include <stdio.h>

int main() {
int year;
int seconds_per_year = 365 * 24 * 3600;
year = (int)((1e9 + seconds_per_year / 2) / seconds_per_year);
printf("10亿秒约等于%d年\n", year);
return 0;
}`

任务六
`#include <stdio.h>

include <math.h>

int main() {
double x, ans;
while(scanf("%lf", &x) != EOF)
{
ans = pow(x, 365);
printf("%.2f的365次方: %.2f\n", x, ans);
printf("\n");
}
return 0;
}`

任务七
`#include <stdio.h>

int main() {
double c, f;
while (scanf("%lf", &c) != EOF) {
f = (9.0 / 5) * c + 32;
printf("摄氏度c = %.2f时, 华氏度f = %.2f\n", c, f);
}
return 0;
}`

任务八
`#include <stdio.h>

include <math.h>

int main() {
double a, b, c, s, area;
while (scanf("%lf%lf%lf", &a, &b, &c) != EOF) {
s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf("a = %.0f, b = %.0f, c = %.0f, area = %.3f\n", a, b, c, area);
}
return 0;
}`