C library function - isalpha()
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Description
The C library function void isalpha(int c) checks if the passed character is alphabetic.
Declaration
Following is the declaration for isalpha() function.
int isalpha(int c);
Parameters
c − This is the character to be checked.
Return Value
This function returns non-zero value if c is an alphabet, else it returns 0.
Example
The following example shows the usage of isalpha() function.
#include <stdio.h> #include <ctype.h> int main () { int var1 = 'd'; int var2 = '2'; int var3 = '\t'; int var4 = ' '; if( isalpha(var1) ) { printf("var1 = |%c| is an alphabet\n", var1 ); } else { printf("var1 = |%c| is not an alphabet\n", var1 ); } if( isalpha(var2) ) { printf("var2 = |%c| is an alphabet\n", var2 ); } else { printf("var2 = |%c| is not an alphabet\n", var2 ); } if( isalpha(var3) ) { printf("var3 = |%c| is an alphabet\n", var3 ); } else { printf("var3 = |%c| is not an alphabet\n", var3 ); } if( isalpha(var4) ) { printf("var4 = |%c| is an alphabet\n", var4 ); } else { printf("var4 = |%c| is not an alphabet\n", var4 ); } return(0); }
Let us compile and run the above program, to produce the following result −
var1 = |d| is an alphabet var2 = |2| is not an alphabet var3 = | | is not an alphabet var4 = | | is not an alphabet
ctype_h.htm
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