c语言：
#include <stdio.h>
#define MAX_LINE 100
FILE *fp;
char line[] = "";
void main() {
fp = fopen("test.txt", "r");
while (fgets (line, MAX_LINE, fp) != NULL) {
printf("%s", line);
}
fclose(fp);
}
php：
<?php
$fp = fopen('test.txt', 'r');
while($line = fgets($fp))
echo $line;
fclose($fp);
?>
ruby：
file = File.open("test.txt", "r")
print file.each_line { |line| puts line }
file.close
python：
file = open("test.txt")
for line in file:
print(line, end='')
file.close()
