/* Test whether a basic isdigit invocation works. */ #include #include "../basic.h" int main(void) { char c1 = '1'; char c2 = 'a'; if ( !isdigit(c1) ) errx(1, "isdigit('%c') was not true", c1); if ( isdigit(c2) ) errx(1, "isdigit('%c') was not false", c2); return 0; }