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#include<stdio.h>
int main(){
int f;
char s[2];
scanf("%s",s);
while((s[0]!=" ")&&(s[1]!=" ")){
f=0;
switch(s[0]){
case b: if(s[1]==d)
	f=1;
	break;
case d: if(s[1]==b)
	f=1;
	break;
case p: if(s[1]==q)
	f=1;
	break;
case q: if(s[1]==p)
	f=1;
	break;
case H: if(s[1]==H)
	f=1;
	break;
}
if(f==1)
printf("Mirrored pair\n");
else
printf("Ordinary pair\n");
scanf("%s",s);
}
return 0;
}

prog.c: In function ‘main’:
prog.c:6: warning: comparison between pointer and integer
prog.c:6: warning: comparison with string literal results in unspecified behavior
prog.c:6: warning: comparison between pointer and integer
prog.c:6: warning: comparison with string literal results in unspecified behavior
prog.c:9: error: ‘b’ undeclared (first use in this function)
prog.c:9: error: (Each undeclared identifier is reported only once
prog.c:9: error: for each function it appears in.)
prog.c:9: error: ‘d’ undeclared (first use in this function)
prog.c:15: error: ‘p’ undeclared (first use in this function)
prog.c:15: error: ‘q’ undeclared (first use in this function)
prog.c:21: error: ‘H’ undeclared (first use in this function)
prog.c:5: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:29: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result

Standard output is empty