实验1

任务1

include <stdio.h>

int main()
{
printf(" O \n");
printf("\n");
printf("I I\n");
return 0;
}

任务2

include <stdio.h>

int main()
{
double a, b, c;

scanf("%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");
return 0;

}

任务3

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();

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;

}

任务4

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 = %f, y = %lf\n",x, y);
return 0;
}

任务5

include <stdio.h>

int main() {
int year;
year = (1000000000 + 31536000 / 2) / 31536000;
printf("10亿秒约等于%d年\n", year);
return 0;
}

任务6

include <stdio.h>

include <math.h>

int main() {
double x, ans;
printf("请输入 x: ");
scanf("%lf", &x);

ans = pow(x, 365);

printf("%.2f 的 365 次方 = %.2f\n", x, ans);
return 0;

}

任务7

include <stdio.h>

int main() {
double c, f;

while (scanf("%lf", &c) != EOF) {

    f = c * 9 / 5 + 32;

    printf("摄氏度c = %.2f时，华氏度f = %.2f\n", c, f);
}
return 0;

}

任务8

include <stdio.h>

include <math.h>

int main() {
double a, b, c;

while (scanf("%lf %lf %lf", &a, &b, &c) != EOF) {

    double s = (a + b + c) / 2;

    double 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;

}