Brother just learning c + +, found the following problems:

 # include & lt; Iostream> 
# include & lt; string> 
# include & lt; Vector> 
# include & lt; Cctype> 
using namespace std; 
Int main () {
String text="Good mornig!" ; 
For (auto it=text. The begin (); it!=text. The end (); + + it) {
Char c=* it; 
Coutreturn 0; 
} 

When the output is like this:
But if the right hand side put toupper:

 c=toupper (c); 
Cout 
The normal output;  
Why ah?
 CodePudding user response: 
Because toupper function return value is an int type, so direct output is plastic, but if use c=toupper, int is converted to char types, the output is the character type
 CodePudding user response: 
You use the 
 c=toupper (c); 
 is equivalent to implicitly convert an int to the char