实验1

//task.1_2.c

include <stdio.h>

int main()
{
printf("%s\t%s\t\n"," 0"," 0");
printf("%s\t%s\t\n","", "");
printf("%s\t%s\t\n","I I","I I");
return 0;
}

//task1_1.c

include <stdio.h>

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

//task2.c

include <stdio.h>

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

scanf_s("%lf%lf%lf" , &a, &b, &c);
if (a + b > c and a + c > b and b + c > a)
    printf("能构成三角形\n");
else
	printf("不能构成三角形\n");

	return 0;

}

//task2.c

include <stdio.h>

int main()
{
char ans1, ans2;

printf("每次课前认真预习，课后及时复习了吗？（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表示有，输入n或N表示没有）; ");
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，我们一起来建设吧\n");
return 0;

}

//task3.c

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", &c1,1, &c2,1, &c3,1);
printf("c1 = %c, c2 = %c, c3 = %c\n", c1, c2, c3);

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

return 0;

}

//task4.c

include <stdio.h>

include<math.h>

int main()
{
double year;
int sec;
int time;

sec = 1000000000;
time = 30758400;
year = sec / time;
year = (int)round(sec / time);

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

}

//task5.c

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;

}

//task6.c

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;

}

//task7.c

include<stdio.h>

include<math.h>

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

return 0;

}

//task8.c

include<stdio.h>

include<math.h>

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

return 0;

}