[c/cpp]：字符计数和文本行计数

[c/cpp]：字符计数和文本行计数

一、代码

 1 #include <iostream>
 2 #include <string>
 3 #include <vector>
 4 
 5 
 6 char input[] = "1\n2\n3\n";
 7 
 8 
 9 // string_length = string_real_length + '\0'.
10 // charstring_length = cslen
11 int cslen(char *p){
12     
13     char end='\0';
14     int size ;
15     
16     // init 'size'
17     if(*p==end) { 
18         size = 0;
19     } else { 
20         size=1;
21     }
22 
23     for(char *c=p; *c!=end; c++) {
24         size += 1;
25     }
26 
27     //std::cout << "\t[str_len]#\t" << size << std::endl;    
28     return size;
29 }
30 
31 
32 // return numbers of line. line, end with '\n'.
33 // line seperated by '\n'
34 int line_no(char *p)
35 {
36     char *c=p;
37     char line_end = '\n';
38     char char_end = '\0';
39     
40     int line_num = 0;
41     
42     for ( ; *c!=char_end; c++) {
43         //std::cout << "\t[test]#\t" << *c << std::endl;
44         if ( *c==line_end ) {
45             line_num += 1;
46         }
47     }
48 
49 
50     //std::cout <<"\t[line_no]#\t" << line_num << std::endl;
51     return line_num;
52 }
53 
54 
55 // test part
56 int main()
57 {
58     std::cout << "\t[string]#\t" << input << std::endl;
59     
60     std::cout << "\t[str_len]#\t" << cslen(input) << std::endl;
61     std::cout << "\t[line_no]#\t" << line_no(input) << std::endl;
62     
63     return 0 ;
64 }

二、运行结果

	[string]#	1
2
3

	[str_len]#	7
	[line_no]#	3

三、参考资料和工具

　　1、　　cpp在线编辑工具　　-　　https://coliru.stacked-crooked.com/