File Handling (read / write) in c and c++ on Visual Studio 2017 1
Shows how to #read from an input #file and #write into an output file using c and c plus plus languages. Shows how to do file #handling and #compile and #run projects on visual studio 2017.
C code:
#include＜stdio.h＞
//_CRT_SECURE_NO_WARNINGS
int main()
{
//FILE *input_file;
//input_file = fopen("test.txt", "r");
//FILE *input_file = fopen("test.txt", "r");
char in_file[] = "test.txt";
FILE *input_file = fopen(in_file, "r");
//FILE *output_file = fopen("test.txt.out", "w");//w for write a for append
char out_file[] = "test.txt"".out";
FILE *output_file = fopen(out_file, "w");//w for write a for append
char line[50];
for (int line_no = 1; fgets(line, sizeof(line), input_file) != NULL; ++line_no)
{
printf("LINE %d: %s", line_no, line);
fprintf(output_file, "LINE %d: %s", line_no, line);
}
if (input_file)
{
fclose(input_file);
fclose(output_file);
}
getch();
return 0;
}
C++ code:
#include ＜iostream＞ //for cout
#include ＜fstream＞ // for ofstream/ifstream
#include ＜string＞ //for ＜＜ and getline
int main()
{
//std::ifstream input_file;
//input_file.open("test.txt");
//std::ifstream input_file("test.txt");
std::string in_file = "test.txt";
std::ifstream input_file(in_file.c_str());
//std::ofstream output_file("test.txt.out");
//std::string out_file = "test.txt"".out";
std::string out_file = "test.txt";
out_file += ".out";
std::ofstream output_file(out_file.c_str());
std::string line;
for (int line_no = 1; std::getline(input_file, line); ++line_no)
{
std::cout ＜＜ "LINE " ＜＜ line_no ＜＜ ":" ＜＜ line ＜＜ std::endl;
output_file ＜＜ "LINE " ＜＜ line_no ＜＜ ":" ＜＜ line ＜＜ std::endl;
}
if (input_file)
{
input_file.close();
output_file.close();
}
std::cin.get();
return 0;
}
#cplusplus #c #tutorial
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