![I'm trying to make a program to switch letter cases, from lower case to upper case and vice versus, but I can't get it to run through the first if statement, any I'm trying to make a program to switch letter cases, from lower case to upper case and vice versus, but I can't get it to run through the first if statement, any](https://i.redd.it/aad3t99ao4n11.jpg)
I'm trying to make a program to switch letter cases, from lower case to upper case and vice versus, but I can't get it to run through the first if statement, any
How to check a string for if it has at least 1 lowercase and at least one uppercase letter in C++ - Quora
![Use the function toupper() in combination with the .strstr() function to find out whether one string occurs in another, ignoring case. - C String Use the function toupper() in combination with the .strstr() function to find out whether one string occurs in another, ignoring case. - C String](http://www.java2s.com/example/c/string/use-the-function-toupper-in-combination-with-the-.strstr-function--e4fb8.png)