C toupper() function
C toupper(int c)
The toupper() function is used to translate lowercase characters to uppercase characters. The function is defined in the ctype.h header file.
Syntax:
int toupper(int ch);
toupper() Parameters:
Name | Description | Required /Optional |
---|---|---|
ch | Argument ch represents a lowercase letter. | Required |
Return value from toupper()
- Upon successful completion, toupper() returns the uppercase letter corresponding to the argument passed; otherwise returns the argument unchanged.
Example: C toupper() function
#include <stdio.h>
#include <ctype.h>
int main() {
char ch;
printf("Convert lower case to upper case:\n");
ch = 'M';
printf("%c -> %c", ch, toupper(ch));
ch = 'k';
printf("\n%c -> %c", ch, toupper(ch));
ch = 'y';
printf("\n%c -> %c", ch, toupper(ch));
ch = 'w';
printf("\n%c -> %c", ch, toupper(ch));
return 0;
}
Output:
Convert lower case to upper case: M -> M k -> K y -> Y w -> W
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Previous C Programming: C tolower()
C Programming: Tips of the Day
What is the static function in C ?
Making a function static hides it from other translation units, which helps provide encapsulation.
helper_file.c
int f1(int); /* prototype */ static int f2(int); /* prototype */ int f1(int foo) { return f2(foo); /* ok, f2 is in the same translation unit */ /* (basically same .c file) as f1 */ } int f2(int foo) { return 42 + foo; }
main.c:
int f1(int); /* prototype */ int f2(int); /* prototype */ int main(void) { f1(10); /* ok, f1 is visible to the linker */ f2(12); /* nope, f2 is not visible to the linker */ return 0; }
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