2025年1月10日 · The toupper() function in C converts lowercase letters to uppercase, while leaving uppercase letters, special symbols, and digits unchanged.

2024年12月20日 · int toupper (int ch ); Converts the given character to uppercase according to the character conversion rules defined by the currently installed C locale. In the default "C" locale, the following lowercase letters abcdefghijklmnopqrstuvwxyz are replaced with respective uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ .

2024年4月4日 · If the character passed is a lowercase alphabet, then the toupper() function converts it to an uppercase alphabet. This function does not affect an uppercase character, special symbol, digits, or other ASCII characters.

This page contains document on toupper() function in C programming with example and explanation.

Converts c to its uppercase equivalent if c is a lowercase letter and has an uppercase equivalent. If no such conversion is possible, the value returned is c unchanged. In C++, a locale-specific template version of this function (toupper) exists in header <locale>. Character to be converted, casted to an int, or EOF.

2024年3月1日 · int toupper( int c ); int _toupper( int c ); int towupper( wint_t c ); int _toupper_l( int c , _locale_t locale ); int _towupper_l( wint_t c , _locale_t locale ); Parameters. c Character to convert. locale Locale to use. Return value. Each of these routines converts a copy of c, if possible, and returns the result.

C Library - toupper() function - The C ctype library tolower() function converts lowercase letter to uppercase. If the given character is already an uppercase letter or is not a lowercase letter, the function returns the character unchanged.

The toupper() function returns the ASCII value of an uppercase version of the character. If the character is not an uppercase character then its value is returned without being changed. The toupper() function is defined in the <ctype.h> header file.

If c is a lowercase letter, toupper() returns its uppercase equivalent, if an uppercase representation exists in the current locale. Otherwise, it returns c. The toupper_l() function performs the same task, but uses the locale referred to by the locale handle locale.

toupper() Function. The toupper() function in C converts a lowercase letter to its uppercase equivalent if one exists. If the provided character does not have a corresponding uppercase version, it remains unchanged.