(a) x = (y + 3);
Valid.
(b) cir = 2*3.141593*r;
Valid.
(c) char = '3';
Error: char is a reserved keyword and cannot be used as a variable. We cannot assign anything to a keyword.
(d) 4/3*3.14*r*r*r = vol_of_sphere
Error: lvalue required. We cannot take any expression on the left of the assignment operator.
(e) volume = a3;
Error: a3 do not specify any operation.
(f) area = 1/2*base*height;
Valid.
(g) si = p*r*n/100;
Valid.
(h) area of circle = 3.14*r*r;
Error: space is not allowed in variable names.
(i) per_of_tri = a + b + c;
Valid.
(j) slope = (y2 - y1)÷(x2 - x1);
Error: This '÷' is not a valid operator.
(k) 3 = b = 4 = a;
Error: lvalue required. Left side should not have any constant value or any expression.
(l) count = count + 1;
Valid.
(m) char ch = '25 Apr 12';
Error: character length must be of one.
