By writing a C language program, the runtime implementation prints the source code and line number of another program

June 1, 2017 program preparation notes:

1. Implement the line number printing, realize the code reading and output, understand the parameter meaning in the main function.

2. Insufficient understanding of the Fgets function

3. To return (1); The meaning of return 0 is not understood enough

4. Printed page numbers are not implemented

1 /*************************************************************************2 > File name:my_print_program.c3 > Author:Mr.Yang4 > Purpose: Write your own program to print the source code and line number of a program (that is, run./my_print_program my_print_program.c You can print the source and line numbers to achieve5 features similar to Cat MY_PRINT_PROGRAM.C features in Linux)6 > Created time:2017 June 01 Thursday 15:38 33 seconds7  ************************************************************************/8 9#include <stdio.h>Ten#include <stdlib.h> One  A /*implementing the path and related parameters for reading executable programs from the command line*/ - intMainintargcChar*argv[]) - { the         Charbuffer[ the]; -FILE *FP; -  -         /*Make argc judgments*/ +         if(ARGC <2) -         { +Puts"\ n Please follow the standard command input, for example: \ "./my_print_program test.c\", where test.c is the source code you need to print! \ n"); A                 return(1);//Thinking of return (1) What is the difference between return 0 and what is the meaning of their realization? Use return (1) Here to implement a program execution if statement without reporting a segment error at         } -  -         /*Open code file*/ -fp = fopen (argv[1],"R"); -  -         /*Read source code*/ in         intline =1; -  to         /*think about why the middle parameter in Fgets is 256, and if you use other values, what does it really mean? */ +          while(Fgets (Buffer, the, fp)! =NULL) -         { the                 /*Debug to print*/ *                 //puts ("1"); $fprintf (stdout,"%4d:%s", line++, buffer);Panax Notoginseng         } -  the fclose (FP); +  A         return 0; the}

The results of the implementation are as follows:

By writing a C language program, the runtime implementation prints the source code and line number of another program