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C library function - isupper()
Description
The C library function int isupper(int c) checks whether the passed character is uppercase letter.
Declaration
Following is the declaration for isupper() function.
int isupper(int c);
Parameters
c − This is the character to be checked.
Return Value
This function returns a non-zero value(true) if c is an uppercase alphabetic letter else, zero (false).
Example
The following example shows the usage of isupper() function.
#include <stdio.h> #include <ctype.h> int main () { int var1 = 'M'; int var2 = 'm'; int var3 = '3'; if( isupper(var1) ) { printf("var1 = |%c| is uppercase character\n", var1 ); } else { printf("var1 = |%c| is not uppercase character\n", var1 ); } if( isupper(var2) ) { printf("var2 = |%c| is uppercase character\n", var2 ); } else { printf("var2 = |%c| is not uppercase character\n", var2 ); } if( isupper(var3) ) { printf("var3 = |%c| is uppercase character\n", var3 ); } else { printf("var3 = |%c| is not uppercase character\n", var3 ); } return(0); }
Let us compile and run the above program that will produce the following result −
var1 = |M| is uppercase character var2 = |m| is not uppercase character var3 = |3| is not uppercase character
ctype_h.htm
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