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#include <stdio.h>

main(t,_,a)
char *a;
{return!0<t?t<3?main(-79,-13,a+main(-87,1-_,
main(-86, 0, a+1 )+a)):1,t<_?main(t+1, _, a ):3,main ( -94, -27+t, a
)&&t == 2 ?_<13 ?main ( 2, _+1, "%s %d %d\n" ):9:16:t<0?t<-72?main(_,
t,"@n'+,#'/*{}w+/w#cdnr/+,{}r/*de}+,/*{*+,/w{%+,/w#q#n+,/#{l,+,/n{n+\
,/+#n+,/#;#q#n+,/+k#;*+,/'r :'d*'3,}{w+K w'K:'+}e#';dq#'l q#'+d'K#!/\
+k#;q#'r}eKK#}w'r}eKK{nl]'/#;#q#n'){)#}w'){){nl]'/+#n';d}rw' i;# ){n\
l]!/n{n#'; r{#w'r nc{nl]'/#{l,+'K {rw' iK{;[{nl]'/w#q#\
n'wk nw' iwk{KK{nl]!/w{%'l##w#' i; :{nl]'/*{q#'ld;r'}{nlwb!/*de}'c \
;;{nl'-{}rw]'/+,}##'*}#nc,',#nw]'/+kd'+e}+;\
#'rdq#w! nr'/ ') }+}{rl#'{n' ')# }'+}##(!!/")
:t<-50?_==*a ?putchar(a[31]):main(-65,_,a+1):main((*a == '/')+t,_,a\
+1 ):0<t?main ( 2, 2 , "%s"):*a=='/'||main(0,main(-61,*a, "!ek;dc \
i@bK'(q)-[w]*%n+r3#l,{}:\nuwloca-O;m .vpbks,fxntdCeghiry"),a+1);}

On the first day of Christmas my true love gave to me
a partridge in a pear tree.

On the second day of Christmas my true love gave to me
two turtle doves
and a partridge in a pear tree.

On the third day of Christmas my true love gave to me
three french hens, two turtle doves
and a partridge in a pear tree.

On the fourth day of Christmas my true love gave to me
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the fifth day of Christmas my true love gave to me
five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the sixth day of Christmas my true love gave to me
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the seventh day of Christmas my true love gave to me
seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the eighth day of Christmas my true love gave to me
eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the ninth day of Christmas my true love gave to me
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the tenth day of Christmas my true love gave to me
ten lords a-leaping,
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the eleventh day of Christmas my true love gave to me
eleven pipers piping, ten lords a-leaping,
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the twelfth day of Christmas my true love gave to me
twelve drummers drumming, eleven pipers piping, ten lords a-leaping,
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

Exercise 12172

The following program uses the math library. Enter compile and run it correctly.

#include <math.h>

	main()

	{ int i;

	   printf("\t Number \t\t Square Root of Number\n\n");

	   for (i=0; i<=360; ++i)
            printf("\t %d \t\t\t %d \n",i, sqrt((double) i));
	}

위의 프로그램을 컴파일하고 제대로 실행하라는 문제군요. 라이브러리를 어떻게 쓰는지에 대한 문제입니다.

위의 내용대로 코드를 입력하고 컴파일을 해봅니다.

[shinnara ~/work/c/unixc]$ gcc exer12172.c
/var/tmp//ccEk6OYt.o(.text+0x4a): In function `main':
: undefined reference to `sqrt'
[shinnara ~/work/c/unixc]$

역시나 sqrt 가 정의되어 있지 않다고 나옵니다. -l 옵션을 붙여줘야 합니다. 

[shinnara ~/work/c/unixc]$ gcc exer12172.c -lm
[shinnara ~/work/c/unixc]$

gcc 옵션과 관련된 자세한 내용은 Gcc 와 Make 강좌를 참조하시기 바랍니다.

컴파일이 제대로 되었으니, 이제 실행을 해봐야 할텐데요. a.out 이 디폴트로 생겼으니 실행을 해봅니다.

[shinnara ~/work/c/unixc]$ ./a.out
         Number                  Square Root Of Number

         0               0.00
         1               1.00
         2               1.41
...
         353             18.79
         354             18.81
         355             18.84
         356             18.87
         357             18.89
         358             18.92
         359             18.95
         360             18.97
[shinnara ~/work/c/unixc]$

그런데 실행된 모습이 다르다구요? 네, 맞습니다. 위의 프로그램을 조금 변경했습니다. 아래는 제 소스입니다.


[shinnara ~/work/c/unixc]$ cat exer12172.c
#include <math.h>

main()
{
    int i;

    printf("\t Number \t\t Square Root Of Number\n\n");

    for(i=0;i<=360;i++)
        printf("\t %d \t\t %.2f\n",i,sqrt((double) i ));
}
[shinnara ~/work/c/unixc]$


이제, 다들 제대로 동작하시죠?