task1

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("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)