Mega Code Archive
Returns nonzero if ch is a letter or zero if not
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//Declaration: int isalpha(int ch);
//Return: returns nonzero if ch is a letter or zero if not.
#include <ctype.h>
#include <stdio.h>
int main(void)
{
char ch;
for(;;) {
ch = getchar();
if(ch == '.') {
break;
}
if(isalpha(ch)) {
printf("%c is a letter\n", ch);
}
}
return 0;
}
/*
b
b is a letter
c
c is a letter
r
r is a letter
.
*/
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