//Header file: #include <ctype.h>
//Declaration: int isdigit(int ch);
//Return: returns nonzero if ch is a digit or zero is returned.
#include <ctype.h>
#include <stdio.h>
int main(void)
{
char ch;
for(;;) {
ch = getchar();
if(ch == '.'){
break;
}
if(isdigit(ch)){
printf("%c is a digit\n", ch);
}
}
return 0;
}
/*
1
1 is a digit
2
2 is a digit
3
3 is a digit
f
.
*/
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