In C, printable characters refer to characters that can be visibly displayed on the screen, including letters, digits, punctuation, and spaces. The ASCII printable character range is from 32 (' ', space) to 126 ('~'). Functions like isprint and isgraph from <ctype.h> help identify these characters.

Example Listing of Printable Characters:

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#include <stdio.h>
#include <ctype.h>

int main() {
printf("Printable ASCII characters:
");
for (int i = 32; i <= 126; i++) {
printf("%c ", i);
}
printf("
");
return 0;