C代写：CS50 C Programming request6

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C语言基础练习题。

Note

  • Work on an request by yourself without sharing the answer to a classmate. (It is great that students study together but an request is an individual task. It is not a group project.)
  • Start to do an request early and ask the teacher if you have a question.
  • Add a comment with your name at the top of your source code
  • Put all your files that you want to submit into one zip file
  • Your folder should have your last name, first name, your class and request number. Example: rattanasook_hathairat_cs50_6.zip
Please save the program with the name ‘files.c’

Write a program that merges two files as follows. The two files are in the docsharing which you can download it.
One file will contain usernames (usernames.txt):

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foster001
smith023
nyuyen002
…

The other file will contain passwords (passwords.txt):

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x34rdf3e
p43e4rdd
w32eds22
…

The program should create a third file matching username and passwords (usernamesPasswords.txt):

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foster001 x34rdf3e
smith023 p43e4rdd
nyuyen002 w32eds22
… …

Give the user of your programs the option of displaying you output file.

Tips

下边是完整实现

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define USERNAME_FILE "usernames.txt"
#define PASSWORD_FILE "passwords.txt"

#define COMBINE_FILE "usernamesPasswords.txt"

int main(int argc, char *argv[]){
	int display; // Whether to show result
	FILE* u_file; // File handler to username
	FILE* p_file; // File handler to password
	FILE* o_file; // File handler to output file
	char line_u[128];
	char line_p[128];
	char line_o[512];

	if(argc == 2 && strcmp(argv[1], "-s") == 0){
		display = 1;
	}else{
		printf("You can add -s option to display output.\n");
		display = 0;
	}

	// Open file
	u_file = fopen(USERNAME_FILE, "r");
	p_file = fopen(PASSWORD_FILE, "r");
	o_file = fopen(COMBINE_FILE, "w");

	// Read file line by line
	while(!feof(u_file)){
		fgets(line_u, 128, u_file);
		fgets(line_p, 128, p_file);

		// Replace '\n' to '\0'
		line_u[strlen(line_u) - 1] = '\0';

		// Concat strings
		sprintf(line_o, "%s\t%s", line_u, line_p);
		if(display == 1){
			printf("%s", line_o);
		}
		// Output file
		fprintf(o_file, "%s", line_o);
	}

	// Close file handler
	fclose(u_file);
	fclose(p_file);
	fflush(o_file);
	fclose(o_file);

	printf("\n");
	system("pause");
	return 0;
}