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#include <stdio.h>
 
int main(void) {
 
	foo("%x");
	return 0;
}
 
void foo(char *str)
{
 
	char c='c';
	printf(str);
 
	printf("\n%x",&c);
}

prog.c: In function 'main':
prog.c:5:2: warning: implicit declaration of function 'foo' [-Wimplicit-function-declaration]
  foo("%x");
  ^
prog.c: At top level:
prog.c:9:6: warning: conflicting types for 'foo'
 void foo(char *str)
      ^
prog.c:5:2: note: previous implicit declaration of 'foo' was here
  foo("%x");
  ^
prog.c: In function 'foo':
prog.c:15:9: warning: format '%x' expects argument of type 'unsigned int', but argument 2 has type 'char *' [-Wformat=]
  printf("\n%x",&c);
         ^
prog.c:16:9: error: \x used with no following hex digits
  printf("\x hi");
         ^

Standard output is empty