strupr() function in C String converts all the characters present in a given string to Uppercase.
The strupr() function is defined in the header file
It takes a single argument that is the name of the string and is written as follows.
C Program for strupr() function
char str = "SimplE2code.Com";
printf("Original String: %s", str);
printf("Uppercase Characters: %s", strupr(str));
Original String: SimplE2code.Com
Uppercase Characters: SIMPLE2CODE.COM
Don’t be alarmed if it does not run on your compiler. It is just that some functions like strupr(), which are only available in ANSI C (Turbo C/C++) and are not available in the standard C-GCC compiler.
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