c++

4. Which of the following are valid type declarations? Explain the invalid ones. (a) int x1, x2: (b) float k3k; (e) int 45: (d) char val3: 6. Are the following statements valid assignment statements. Explain the invalid ones. (a) float x2 = 45.67; (b) Sval = 89; (c) x2*y=1; (d) int run_time = 67; 8 Write statements to store the following values in memory cells of the system. (a) 564 (b) 78.63 (e) 10. Write a complete program to compute the expression 3x + 2y when x= 45 and y = 29.567 and to write the answer on the screen with some descriptive text