Split Code to Multiple (source / header) Files in c and c++ on Linux (bash) 13
Shows how to manage code with #multiple #header and #source files in c and c plus plus #projects on #Linux/#unix. Shows how to #divide/#split code into #separate files and to #run and #compile c and c plus plus #programs on #bash.
c code:
//main.c is one source file
#include＜stdio.h＞
#include＜string.h＞
#include "Header.h"
//void pullout_contents(char *in_file, char elements[][50]);
//void show_contents(const char elements[][50]);
//void pushin_contents(char out_file[], const char elements[][50]);
int main()
{
char in_file[] = "test.txt";
char out_file[] = "test.txt.out";
char elements[25][50];
pullout_contents(in_file, elements);
show_contents(elements);
pushin_contents(out_file, elements);
getch();
return 0;
}
//Program.c is another source file
#include＜stdio.h＞
#include＜string.h＞
void pullout_contents(char *in_file, char elements[][50])
{
FILE *input_file = fopen(in_file, "r");
char line[50];
for (int line_no = 1; fgets(line, sizeof(line), input_file) != NULL; ++line_no)
{
strcpy(elements[line_no], line);
}
fclose(input_file);
}
void show_contents(const char elements[][50])
{
for (int line_no = 1; line_no ＜3; ++line_no)
{
printf("%s", elements[line_no]);
}
}
void pushin_contents(char out_file[], const char elements[][50])
{
FILE* output_file = fopen(out_file, "w");//w for write a for append
for (int line_no = 1; line_no ＜3; ++line_no)
{
fprintf(output_file, "%s", elements[line_no]);
}
fclose(output_file);
}
//Header.h is a header file
#pragma once
#ifndef ELEMENTS
#define ELEEMNTS
void pullout_contents(char *in_file, char elements[][50])
{
FILE *input_file = fopen(in_file, "r");
char line[50];
for (int line_no = 1; fgets(line, sizeof(line), input_file) != NULL; ++line_no)
{
strcpy(elements[line_no], line);
}
fclose(input_file);
}
void show_contents(const char elements[][50])
{
for (int line_no = 1; line_no ＜3; ++line_no)
{
printf("%s",elements[line_no]);
}
}
void pushin_contents(char out_file[], const char elements[][50])
{
FILE* output_file = fopen(out_file, "w");//w for write a for append
for (int line_no = 1; line_no ＜3; ++line_no)
{
fprintf(output_file, "%s", elements[line_no]);
}
fclose(output_file);
}
#endif // !ELEMENTS
Linux Commands:
$ gcc *.c -o main
Or
$ gcc main.c -o main
$ ./main test.txt
c++ code:
//Source.cpp is a source file
#include ＜iostream＞ //for cout
#include ＜fstream＞ // for ofstream/ifstream
#include ＜string＞ //for ＜＜ and getline
#include "Header.h"
//void pullout_contents(std::string in_file, std::string elements[]);
//void show_contents(const std::string elements[]);
//void pushin_contents(std::string out_file, const std::string elements[]);
int main()
{
std::string in_file = "test.txt";
std::string out_file = "test.txt.out";
std::string elements[100];
pullout_contents(in_file, elements);
show_contents(elements);
pushin_contents(out_file, elements);
std::cin.get();
return 0;
}
//Program.cpp is another source file
#include ＜iostream＞ //for cout
#include ＜fstream＞ // for ofstream/ifstream
#include ＜string＞ //for ＜＜ and getline
void pullout_contents(std::string in_file, std::string elements[])
{
std::ifstream input_file(in_file.c_str());
std::string line;
for (int line_no = 1; std::getline(input_file, line); ++line_no)
{
elements[line_no] = line;
}
input_file.close();
}
void show_contents(const std::string elements[])
{
for (int line_no = 1; line_no ＜ 3; line_no++)
{
std::cout ＜＜ elements[line_no] ＜＜ std::endl;
}
}
void pushin_contents(std::string out_file, const std::string elements[])
{
std::ofstream output_file(out_file.c_str());
for (int line_no = 1; line_no ＜ 3; line_no++)
{
output_file ＜＜ elements[line_no] ＜＜ std::endl;
}
output_file.close();
}
//Header.h is a header file
#pragma once
#ifndef ELEMENTS
#define ELEMENTS
//void pullout_contents(std::string in_file, std::string elements[]);
//void show_contents(const std::string elements[]);
//void pushin_contents(std::string out_file, const std::string elements[]);
void pullout_contents(std::string in_file, std::string elements[])
{
std::ifstream input_file(in_file.c_str());
std::string line;
for (int line_no = 1; std::getline(input_file, line); ++line_no)
{
elements[line_no] = line;
}
input_file.close();
}
void show_contents(const std::string elements[])
{
for (int line_no = 1; line_no ＜ 3; line_no++)
{
std::cout ＜＜ elements[line_no] ＜＜ std::endl;
}
}
void pushin_contents(std::string out_file, const std::string elements[])
{
std::ofstream output_file(out_file.c_str());
for (int line_no = 1; line_no ＜ 3; line_no++)
{
output_file ＜＜ elements[line_no] ＜＜ std::endl;
}
output_file.close();
}
#endif // !ELEMENTS
Linux commands:
$ g++ *.cpp -o Source
or
$ g++ Source.cpp -o Source
$ ./Source test.txt
#cplusplus #c #tutorial
Linking Multiple File Projects C Tutorial
Compiling and Linking Multiple Files in C++