isascii in c

What is isascii in c programming?

isascii in c checks the passed value is ascii character or not.

This function is defined in ctype.h header file.

This function returns non-zero digit if passed value is ascii character otherwise zero.

Prototype

int isascii(int a);

Parmeter

This function takes character as input parameter and converts it into ASCII value.

Return value

This function returns non-zero value if passed value is ascii character otherwise zero.

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Example program for isascii function in c

#include<stdio.h>
#include<ctype.h>
int main()
{
  char val='a';
  if(isascii(val))
    printf("This is ascii character \n");
   else
    printf("This is not ascii character \n");
  return 0;
}

Code explanation

isascii function is called to determine whether the given input is ASCII or not. The result is being printed onto the console.

isascii() Man page

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Difference between isascii and isalpha in c

isascii function checks the passed value is ASCII character or not. isalpha function checks the passed character is alphabetic or not.

Prototypes are as follows

int isascii(int a);

int isalpha(int a);

isascii in c	isalpha in c
Checks the passed value is ascii character or not.	Checks the passed character is alphabetic or not.
int isascii(int a);	int isalpha(int a);

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Write your own isascii function.

All valid ascii characters are from 0 to 127.

int own_isascii(int char)
{
  return((char <= 127) && (char >= 0));
}

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