do you see anything wrong with this program?

[seal]

#include <stdio.h>
int main ()
{
double a;
double b;
double s1;
double s2;
double hyp;
printf ("please give the value of side a\n");
scanf ("%lf", &a);
printf ("please give the value of side b\n");
scanf ("%lf", &b);
1a = (b* b) - (a* a);
2a = (2* a)* (b);
hyp = (a* a) + (b* b);
printf ("side 1 equals ");
printf ("%lf\n", s1);
printf ("side 2 equals ");
printf ("%lf\n", s2);
printf ("hypotenuse equals ");
printf ("%lf\n", hyp);
return 0;
}

the program is for my friend, and she gets the error
invalid suffix "a" on integer constant

what is the problem?

[XSquared]

1a = (b* b) - (a* a);
2a = (2* a)* (b);

You haven't declared these variables, and also, variable names can't begin with numbers.

[cwr]

Plus if you're trying to apply pythagorus' theorem, the logic would be hyp = sqrt(a*a + b*b);

[seal]

1a = (b* b) - (a* a);
2a = (2* a)* (b);

You haven't declared these variables, and also, variable names can't begin with numbers.

dang... cant believe i missed those.... thx!