task1
`#nclude<stdio.h>
int main()
{
printf(" O \n");
printf(" \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(" \n");
printf(" I I I I\n");

return 0;

}`

task2
`#include<stdio.h>
int main()
{
float a,b,c;
scanf("%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;

}`

task3
`#include<stdio.h>
int main()
{
char ans1,ans2;

printf("输入Y、y or N、n: ");
ans1 = getchar();

getchar();

printf("\n输入Y、y or N、n: ");
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;

}`

line9去掉后结果

getchar()意思是吃掉回车键

task4
`#include<stdio.h>
int main()
{
double x,y;
char c1,c2,c3;
int a1,a2,a3;

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

scanf(" %c %c %c",&c1,&c2,&c3);/*加空格吃掉回车符*/
printf("c1 = %c,c2 = %c,c3 = %c\n",c1,c2,c3);

scanf("%lf %lf",&x,&y);/*去掉逗号*/
printf("x = %f,y = %lf\n",x,y);

return 0;

}`

task5
`#include<stdio.h>
int main()
{
int year;
unsigned long long s;

scanf("%llu",&s);
year = s * 10 / 31536000 + 5;
year = year / 10;
printf("10亿秒约等于%d年\n", year);

return 0;

}`

task6
`#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;

}`

task7
`#include<stdio.h>

include<math.h>

int main()
{
double F,C;

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

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

return 0;

}`

task8
`#include<stdio.h>

include<math.h>

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

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

{
s = (a+b+c)/2.0;
area = sqrt(s(s-a)(s-b)*(s-c));
printf("a=%d,b=%d,c=%d,area=%.3f",a,b,c,area);
printf("\n");}

return 0;

}`

疑问：输入数据时没有\n，打印时却自动换行？即打印输入数据时数据不处于一行