How to toggle each character in a string in C++

This is a simple C++ program to toggle each character in a string. In the program a string is given as input in which all the lower case letters are converted to upper case and the upper case letters are converted to lower case. @programmingwithannu Thanks!
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[lawsonmarcmaconair]

Hello, I need cpp program that can Encrypt a given character string by replacing each letter with its alphabetical order number and the spaces with the value 0 (A or a will be replaced by 1, B or b by 2, C or c by 3, etc.). Display the encrypted string.