将数字以单词形式输出（C语⾔实现）
程序简单地实现了输⼊不⼤于九位的数字，以英⽂单词的形式输出。
在⼩的位数上使⽤了暴⼒穷举的⽅法实现数字转换为单词，使得⽐较代码冗长……
基本⽅法是先将九位数分割成三段分别处理，不⾜九位，则⾼位补零。
定义头⽂件和函数：
1 #include<stdio.h>
2 #include<string.h>
3 #include<stdlib.h>
4void written_amount(int num,char *buffer);
5void written_three(int num,char *buffer);
6void written_two(int a,char *buffer);
主函数：
int main(void)
{
int num;
char *buffer;
buffer=malloc(sizeof(char *)*200) ;
printf("Enter the number:");
scanf("%d",&num);
written_amount(num,buffer);
printf("The %d's homologous string is :\n %s\n",num,buffer);
return0;
}
write_amount函数：
先将输⼊的数字分成三部分，分别赋给num3、num2、num1；例如：输⼊的是12345，则num3=0；num2=12，num1=345；
声明三个字符串指针，⽤来将num1、num2、num3分别转换成字符串后赋给buffer1、buffer2、buffer3.这需要调⽤
written_three函数。
最后将buffer1、2和3分别判断是否为“zero”，不是的话将它们拼接到⼀起赋值给buffer。
3//分配三个字符串指针，⽤来接收分别来⾃num1，num2和num3的字符串
4
5char *buffer1=NULL,*buffer2=NULL,*buffer3=NULL;
6 buffer1=malloc(sizeof(char*)*40);
7 buffer2=malloc(sizeof(char*)*40);
8 buffer3=malloc(sizeof(char*)*40);
9int count=1;
10int x=num/10;
11while(x!=0){
12 count++;
13 x=x/10;
14 }
15// printf("%d\n",count);
16int num1=0,num2=0,num3=0;
17//将要转换的数值num以每三位为⼀组分割给num1，num2，num3
18if(count>=1 && count<=3){
19 num1=num;
20 }
21else if(count>3 && count<=6){
22 num1=num%1000;
23 num2=num/1000;
24 }
25else{
26 num1=num%1000;
27 num2=(num/1000)%1000;
28 num3=num/1000000;
c++strcpy函数用法
29 }
30//调⽤written_three函数三次，分别将三个数字输出为英语字符形式
31 written_three(num1,buffer1);
32
33 written_three(num2,buffer2);
34
35 written_three(num3,buffer3);
36//将buffer1、2、3的值copy给buffer，如果为零则忽略
37if(!strcmp(buffer3,"zero")) {
38
39if(!strcmp(buffer2,"zero")){
40
41 strcpy(buffer,buffer1);
42
43 }
44else{
45 strcpy(buffer,buffer2);
46 strcat(buffer," thousand and ");
47 strcat(buffer,buffer1);
48 }
49 }
50else{
51 strcpy(buffer,buffer3);
52 strcat(buffer," million and ");
53 strcat(buffer,buffer2);
54 strcat(buffer," thousand and ");
55 strcat(buffer,buffer1);
56 }
57//接收完毕将buffer1、buffer2和buffer3连接起来copy给buffer
58 }
written_three函数：
这个简单的函数⽤同样的原理，先判断是否满三位数，不满三位，则直接调⽤write_two函数，否则，先判断最⾼位，将其转化为字符串buffer，然后和调⽤write_two函数返回的字符串
拼接，返回结果。
3int n=num%100;
4char *p;
5 p=malloc(sizeof(char *)*40);
6// printf("%d\n",n);
7//判断num是否是0，是的话直接返回buffer=NULL，否则判断它的位数，返回对应的英⽂字符 8if(num/100==0){
9 written_two(num,buffer);
10// printf("%s\n",buffer);
11 }
12else {
13switch(num/100){
14case1: strcpy(buffer,"one hundred "); break;
15case2: strcpy(buffer,"two hundred "); break;
16case3: strcpy(buffer,"three hundred "); break;
17case4: strcpy(buffer,"four hundred "); break;
18case5: strcpy(buffer,"five hundred "); break;
19case6: strcpy(buffer,"six hundred "); break;
20case7: strcpy(buffer,"seven hundred "); break;
21case8: strcpy(buffer,"eight hundred "); break;
22case9: strcpy(buffer,"nine hundred "); break;
23 }
24 written_two(n,p);
25// printf("%s\n",p);
26 strcat(buffer,p);
27// printf("%s\n",buffer);
28 }
29 }
write_two函数（糟糕的穷举法，⼤神请忽略）：
将⼆位数转化为对应的字符串。
1void written_two(int a,char *buffer)
2 {
3
4int count=1,i;
5int x=a/10;
6while(x!=0){
7 count++;
8 x=x/10;
9 }
10switch(count){
11case1:{
12switch(a){
13case0: strcpy(buffer,"zero"); break;
14case1: strcpy(buffer,"one"); break;
15case2: strcpy(buffer,"two"); break;
16case3: strcpy(buffer,"three"); break;
17case4: strcpy(buffer,"four"); break;
18case5: strcpy(buffer,"five"); break;
19case6: strcpy(buffer,"six"); break;
20case7: strcpy(buffer,"seven"); break;
21case8: strcpy(buffer,"eight"); break;
22case9: strcpy(buffer,"nine"); break;
23 }
24 }break;
25case2:{
26if(a%10==0){
27switch(a/10){
28case1: strcpy(buffer,"ten"); break;
29case2: strcpy(buffer,"twenty"); break;
30case3: strcpy(buffer,"thirty"); break;
31case4: strcpy(buffer,"fourty"); break;
32case5: strcpy(buffer,"fifty"); break;
33case6: strcpy(buffer,"sixty"); break;
34case7: strcpy(buffer,"seventy"); break;
35case8: strcpy(buffer,"eighty"); break;
36case9: strcpy(buffer,"ninety"); break;
37 }
38 }
39else if(a/10==1){
40switch(a%10){
41case1: strcpy(buffer,"eleven"); break;
42case2: strcpy(buffer,"twelve"); break;
43case3: strcpy(buffer,"thirteen"); break;
44case4: strcpy(buffer,"fourteen"); break;
45case5: strcpy(buffer,"fifteen"); break;
46case6: strcpy(buffer,"sixteen"); break;
47case7: strcpy(buffer,"seventeen"); break;
48case8: strcpy(buffer,"eighteen"); break;
49case9: strcpy(buffer,"nineteen"); break;
50 }
51 }
52else {
53switch(a/10){
54case2:{
55switch(a%10){
56case1:strcpy(buffer,"twenty-one"); break; 57case2:strcpy(buffer,"twenty-two"); break; 58case3:strcpy(buffer,"twenty-three"); break; 59case4:strcpy(buffer,"twenty-four"); break; 60case5:strcpy(buffer,"twenty-five"); break; 61case6:strcpy(buffer,"twenty-six"); break; 62case7:strcpy(buffer,"twenty-seven"); break; 63case8:strcpy(buffer,"twenty-eight"); break; 64case9:strcpy(buffer,"twenty-nine"); break;
65 }
66 }break;
67case3:{
68switch(a%10){
69case1:strcpy(buffer,"thirty-one"); break; 70case2:strcpy(buffer,"thirty-two"); break; 71case3:strcpy(buffer,"thirty-three"); break; 72case4:strcpy(buffer,"thirty-four"); break;
73case5:strcpy(buffer,"thirty-five"); break;
74case6:strcpy(buffer,"thirty-six"); break; 75case7:strcpy(buffer,"thirty-seven"); break; 76case8:strcpy(buffer,"thirty-eight"); break; 77case9:strcpy(buffer,"thirty-nine"); break;
78 }
79 } break;
80case4:{
81switch(a%10){
82case1:strcpy(buffer,"fourty-one"); break; 83case2:strcpy(buffer,"fourty-two"); break; 84
case3:strcpy(buffer,"fourty-three"); break; 85case4:strcpy(buffer,"fourty-four"); break;
86case5:strcpy(buffer,"fourty-five"); break;
87case6:strcpy(buffer,"fourty-six"); break; 88case7:strcpy(buffer,"fourty-seven"); break; 89case8:strcpy(buffer,"fourty-eight"); break; 90case9:strcpy(buffer,"fourty-nine"); break;
91 }
92 }break;
93case5:{
94switch(a%10){
95case1:strcpy(buffer,"fifty-one"); break;
96case2:strcpy(buffer,"fifty-two"); break;
97case3:strcpy(buffer,"fifty-three"); break;
98case4:strcpy(buffer,"fifty-four"); break;
99case5:strcpy(buffer,"fifty-five"); break; 100case6:strcpy(buffer,"fifty-six"); break; 101case7:strcpy(buffer,"fifty-seven"); break; 102case8:strcpy(buffer,"fifty-eight"); break;
103case9:strcpy(buffer,"fifty-nine"); break; 104 }
105 }break;
106case6:{
107switch(a%10){
108case1:strcpy(buffer,"sixty-one"); break; 109case2:strcpy(buffer,"sixty-two"); break; 110case3:strcpy(buffer,"sixty-three"); break; 111case4:strcpy(buffer,"sixty-four"); break; 112case5:strcpy(buffer,"sixty-five"); break; 113case6:strcpy(buffer,"sixty-six"); break; 114case7:strcpy(buffer,"sixty-seven"); break; 115case8:strcpy(buffer,"sixty-eight"); break; 116case9:strcpy(buffer,"sixty-nine"); break; 117 }
118 }break;
119case7:{
120switch(a%10){
121case1:strcpy(buffer,"seventy-one"); break; 122case2:strcpy(buffer,"seventy-two"); break; 123case3:strcpy(buffer,"seventy-three"); break; 124case4:strcpy(buffer,"seventy-four"); break; 125case5:strcpy(buffer,"seventy-five"); break; 126case6:strcpy(buffer,"seventy-six"); break; 127case7:strcpy(buffer,"seventy-seven"); break; 128case8:strcpy(buffer,"seventy-eight"); break; 129case9:strcpy(buffer,"seventy-nine"); break; 130 }
131 }break;
132case8:{
133switch(a%10){
134case1:strcpy(buffer,"eighty-one"); break; 135case2:strcpy(buffer,"eighty-two"); break; 136case3:strcpy(buffer,"eighty-three"); break; 137case4:strcpy(buffer,"eighty-four"); break; 138case5:strcpy(buffer,"eighty-five"); break; 139case6:strcpy(buffer,"eighty-six"); break; 140case7:strcpy(buffer,"eighty-seven"); break; 141case8:strcpy(buffer,"eighty-eight"); break; 142case9:strcpy(buffer,"eighty-nine"); break; 143 }
144 }break;
145case9:{
146switch(a%10){
147case1:strcpy(buffer,"ninety-one"); break; 148case2:strcpy(buffer,"ninety-two"); break; 149case3:strcpy(buffer,"ninety-three"); break; 150case4:strcpy(buffer,"ninety-four"); break; 151case5:strcpy(buffer,"ninety-five"); break; 152case6:strcpy(buffer,"ninety-six"); break; 153case7:strcpy(buffer,"ninety-seven"); break; 154case8:strcpy(buffer,"ninety-eight"); break; 155case9:strcpy(buffer,"ninety-nine"); break; 156 }
157 }break;
158 }
159 }
160 }break;
161default:printf("ERROR!"); exit(EXIT_FAILURE);
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