toupper() function in C
The toupper() function is used to convert lowercase alphabet to uppercase. i.e. If the character passed is a lowercase alphabet then the toupper() function converts a lowercase alphabet to an uppercase alphabet. It is defined in the ctype.h header file.
Syntax:
int toupper(int ch);
Parameter: It accepts a single parameter:
- ch: This represents the character to be converted to uppercase.
Returns: This function returns the uppercase character corresponding to the ch.
Below programs illustrate the toupper() function in C:
Example 1:-
c
// C program to demonstrate // example of toupper() function. #include <ctype.h> #include <stdio.h> int main() { char ch; ch = 'g' ; printf ( "%c in uppercase is represented as %c" , ch, toupper (ch)); return 0; } |
Output:
g in uppercase is represented as G
Example 2:-
C
// C program to demonstrate // example of toupper() function. #include <ctype.h> #include <stdio.h> int main() { int j = 0; char str[] = "geekforBeginner\n" ; char ch; while (str[j]) { ch = str[j]; putchar ( toupper (ch)); j++; } return 0; } |
Output:
GEEKFORBeginner
Note:
If the character passed in the toupper() is any of these three
1. uppercase character
2. special symbol
3. digit
toupper() will return the character as it is.
Example :
C
// C program to demonstrate // example of toupper() function. #include <ctype.h> #include <stdio.h> int main() { int j = 0; char str[] = "GeEks@123\n" ; char ch; while (str[j]) { ch = str[j]; putchar ( toupper (ch)); j++; } return 0; } // code is contributed by codersaty |
Output:
Beginner@123