Caesar cipher

C program,

caesar.c

such that the letter shifting logic

is in a function called shift() which has the following declaration

void shift(char *ch);

Your program must:

1.

Have a global variable called key where you will store the input key

.

2.Implement the above function with the letter shifting logic. Notice that the function parameter is a character pointer and returns nothing.

3.

The main() function must call shift()

function for each of the input character and print/display the final result

.

Example execution

Enter a key: 5

Enter a message: Attack at MIDNIGHT.

Output: Fyyfhp fy RNISNLMY.