#include <stdio.h>

int a, b, c, y;

void main()
{
scanf("%d %d %d", &a, &b, &c);
y = a * a - b * b - c * c;
if (y == 0)
printf("%d, %d, %d is a right-angled triangle!\n", a, b, c);
}

#include <stdio.h>

int score;
int flag;
char rank;

void main()
{
scanf("%d", &score);
flag = score / 10;
switch (flag)
{
case 10:
case 9:
rank = 'A';
break;
case 8:
rank = 'B';
break;
case 7:
rank = 'C';
break;
case 6:
rank = 'D';
break;
default:
rank = 'F';
}
printf("The rank of %d is %c.\n", score, rank);
}


#include <stdio.h>

int score;
char rank;

void main()
{

scanf("%d", &score);
if (score >= 90)

rank = 'A';

else if (score >= 80)

rank = 'B';

else if (score >= 70)

rank = 'C';

else if (score >= 60)

rank = 'D';

else

rank = 'F';

printf("The rank of %d is %c.\n", score, rank);

}


#include <stdio.h>

int a, b;

void main()
{
scanf("%d %d", &a, &b);
if (a > b)
printf("%d is bigger than %d.\n", a, b);
else if (a < b)
printf("%d is bigger than %d.\n", b, a);
else
printf("%d is equal to %d\n", a, b);
}

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