its a lab report, please solve it using matlab A4-1. Using if.....elseif else structure, write a program

its a lab report, please solve it using matlab 

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A4-1. Using if.....elseif else structure, write a program for the following grading policy of a University. A (Excellent) 90 to 100 B+ (Very Good) 85 to <90 B (Good) 80 to <85 Fail = <80 Note: If there is a negative value as an input, it will show an error message "negative value is not allowed". Execute the program and display the results, whenever the grade is 90, -89, 85, and 79 A4-2. Create an index of a book by using Switch Structure with the condition below: Chapter 1: Introduction Chapter 2: Modeling Chapter 3: Programming If the chapter is not between 1-3, it will show an error message "The Index number is not vailed". Execute the program and display the results, whenever the chapter number is 1, 2, 3, and 4 A4-3. (a) Plot the bungee jumper velocity by using fplot over the range from 1-0 to 12 sec by using @ v= 9.81 80 0.25 9.81 0.25 tanh (V t) 80 (b). Pass the function to the m-file and find out average velocity from t-1 to 12. A4-1. Using if.....elseif else structure, write a program for the following grading policy of a University. A (Excellent) 90 to 100 B+ (Very Good) 85 to <90 B (Good) 80 to <85 Fail = <80 Note: If there is a negative value as an input, it will show an error message "negative value is not allowed". Execute the program and display the results, whenever the grade is 90, -89, 85, and 79 A4-2. Create an index of a book by using Switch Structure with the condition below: Chapter 1: Introduction Chapter 2: Modeling Chapter 3: Programming If the chapter is not between 1-3, it will show an error message "The Index number is not vailed". Execute the program and display the results, whenever the chapter number is 1, 2, 3, and 4 A4-3. (a) Plot the bungee jumper velocity by using fplot over the range from 1-0 to 12 sec by using @ v= 9.81 80 0.25 9.81 0.25 tanh (V t) 80 (b). Pass the function to the m-file and find out average velocity from t-1 to 12.