Write a program to convert a letter to a number for cell phones using a function. The program asks the user to enter a letter then use a function to convert the letter into a number

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1. Write a program to convert a letter to a number for cell phones using a function. The program asks the user to enter a letter then use a function to convert the letter into a number based on the figure shown in the next page. Asking the user, reading the letter, and displaying the digit is done in function main. Only the conversion is done in the function.

      For Example: the user enters the letter b, then the program calls a function (you defined) and pass the letter b to the function, which converts the letter to a digit based on the above figure and returns the digit 2 to be displayed to the user.

Sample Output:

Enter a letter: b

Digit: 2

 

2. Write a program for checking whether a number is prime or not. The program asks the user to enter a number N then pass it to a function. The function returns 1 if N is prime, 0 otherwise. Asking the user, reading number N, and displaying whether N is prime or not is done in function main. Checking whether N is prime or not is done in a function you defined.

Sample Output:

Enter a number: 17

17 is prime

3. Write a program to read two 2D matrices in main then call a function (you defined) to find the multiplication of the two matrices and returns it back to main to be displayed.

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