C library functions - isupper ()
C standard library - <ctype.h>
description
Whether the C library functionint isupper (int c) Check the transmission characters are uppercase.
statement
Here is () statement isupper function.
int isupper(int c);
parameter
- c - This was a test of character.
return value
If c is an uppercase letter, the function returns a nonzero value (true), otherwise it returns 0 (false).
Examples
The following example demonstrates isupper () function is used.
#include <stdio.h>
#include <ctype.h>
int main()
{
int var1 = 'M';
int var2 = 'm';
int var3 = '3';
if( isupper(var1) )
{
printf("var1 = |%c| 是大写字母\n", var1 );
}
else
{
printf("var1 = |%c| 不是大写字母\n", var1 );
}
if( isupper(var2) )
{
printf("var2 = |%c| 是大写字母\n", var2 );
}
else
{
printf("var2 = |%c| 不是大写字母\n", var2 );
}
if( isupper(var3) )
{
printf("var3 = |%c| 是大写字母\n", var3 );
}
else
{
printf("var3 = |%c| 不是大写字母\n", var3 );
}
return(0);
}
Let's compile and run the above program, which will result in the following:
var1 = |M| 是大写字母 var2 = |m| 不是大写字母 var3 = |3| 不是大写字母