#include <stdio.h> int main( ) { return 0; }
Standard input is empty
prog.c: In function ‘main’: prog.c:5:10: error: ‘a’ undeclared (first use in this function) putchar(a); ^ prog.c:5:10: note: each undeclared identifier is reported only once for each function it appears in prog.c:4:7: warning: unused variable ‘c’ [-Wunused-variable] char c = getchar( ); ^
Standard output is empty