作者CindyLinz (Cindy Wang)
看板C_and_CPP
標題Re: [問題] 九九乘法表不用迴圈是叫我直接從1列到81?
時間Wed Jul 18 03:16:44 2018
※ 引述《red0whale (red whale)》之銘言：
: 剛才做題目，
: https://i.imgur.com/NI4TYj5.jpg
: 九九乘法表用兩個或一個迴圈來做我都會
: 但不用迴圈叫我列九九乘法表是哪招？
: 難道是要我直接從1*1列到9*9嗎？
: 還是其實有妙招？
: 說實在我真想不到不用迴圈就能簡單列出九九乘法表的方法了
這一個版本.. 我只能確定 it works on my machine....XD (x86_64)
99.c:
#include <stdio.h>
long long salon(
long long hair,
int i){
if( i <
1 ) hair =
2[&hair];
if( i <
81 )
2[&hair] = hair;
return hair;
}
int main(){
int i = -
1;
long long hair = salon(hair, ++i);
printf(
"%d x %d = %2d %c", i/
9+
1, i%
9+
1, (i/
9+
1) * (i%
9+
1),
32-
22*!(i%
9-
8));
hair = salon(hair, ++i);
return 0;
}
$ gcc -O0 -o 99 99.c
$ ./99
1 x 1 = 1 1 x 2 = 2 1 x 3 = 3 1 x 4 = 4 1 x 5 = 5 1 x 6 = 6 1 x 7 = 7 1 x 8 = 8 1 x 9 = 9
2 x 1 = 2 2 x 2 = 4 2 x 3 = 6 2 x 4 = 8 2 x 5 = 10 2 x 6 = 12 2 x 7 = 14 2 x 8 = 16 2 x 9 = 18
3 x 1 = 3 3 x 2 = 6 3 x 3 = 9 3 x 4 = 12 3 x 5 = 15 3 x 6 = 18 3 x 7 = 21 3 x 8 = 24 3 x 9 = 27
4 x 1 = 4 4 x 2 = 8 4 x 3 = 12 4 x 4 = 16 4 x 5 = 20 4 x 6 = 24 4 x 7 = 28 4 x 8 = 32 4 x 9 = 36
5 x 1 = 5 5 x 2 = 10 5 x 3 = 15 5 x 4 = 20 5 x 5 = 25 5 x 6 = 30 5 x 7 = 35 5 x 8 = 40 5 x 9 = 45
6 x 1 = 6 6 x 2 = 12 6 x 3 = 18 6 x 4 = 24 6 x 5 = 30 6 x 6 = 36 6 x 7 = 42 6 x 8 = 48 6 x 9 = 54
7 x 1 = 7 7 x 2 = 14 7 x 3 = 21 7 x 4 = 28 7 x 5 = 35 7 x 6 = 42 7 x 7 = 49 7 x 8 = 56 7 x 9 = 63
8 x 1 = 8 8 x 2 = 16 8 x 3 = 24 8 x 4 = 32 8 x 5 = 40 8 x 6 = 48 8 x 7 = 56 8 x 8 = 64 8 x 9 = 72
9 x 1 = 9 9 x 2 = 18 9 x 3 = 27 9 x 4 = 36 9 x 5 = 45 9 x 6 = 54 9 x 7 = 63 9 x 8 = 72 9 x 9 = 81
--
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