1 #include<stdio.h>
2
3 #include<string.h>
4
5 #include<stdlib.h>
6
7
8
9
10 void PrintString(char *p,char *In_num)
11
12 {
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14 int i=0;
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16 int lenth;
17
18 if(strlen(p)<4)
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20 puts(In_num);
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22 else
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24 {
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26 lenth=strlen(p)%3;
27
28 for(i=0;p[i]!='\0';i++)
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30 {
31
32 printf("%c",p[i]);
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34 if((i+1)%3==lenth&&p[i+1]!='\0')
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36 printf("%c",44);
37
38 }
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40 }
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42 }
43
44 int main(void)
45
46 {
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48 char *In_num,*str;
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50 int i=0;
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52 In_num=(char *)malloc(sizeof(char *));
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54 str=(char *)malloc(sizeof(char *));
55
56 if(In_num==NULL) //检查分配是否成功;
57
58 {
59
60 printf("Can't get so many values.\n");
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62 exit(1);
63
64 }
65
66 printf("Please input the num_string:\n");
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68 gets(In_num);
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70 strcpy(str,In_num);
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72 char *p;
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74 char *n[2];
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76 p=strtok(str,".");
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78 while(p)
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80 {
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82 n[i++]=p;
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84 p=strtok(NULL,".");
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86 }
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88 PrintString(n[0],In_num);
89
90 if(i==2&&strlen(n[0])>=4)
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92 {
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94 printf(".");
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96 for(i=0;n[1][i]!='\0';i++)
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98 {
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100 printf("%c",n[1][i]);
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102 }
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104 }
105
106 printf("\n");
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108 free(In_num); //释放;
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110 free(str);//释放;
111
112 getchar();
113
114 return 0;
115
116 }
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