Answer:
Code which is pasted in the place of "/* Your solution goes here */":
if (isalpha(passCode[0])) // if statement for the first character of the passcode string.
passCode[0]='_';
if (isalpha(passCode[1])) // if statement for the second character of the passcode string.
passCode[1]='_';
Output:
Explanation:
Missing information:
Code Explanation: