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Ex5: Input Streams

master
Eric Teunis de Boone 2 years ago
parent
commit
a54f03b178
  1. 43
      ex5.1/readfromstdin.cpp
  2. 35
      ex5.2/main.cpp
  3. 52
      ex5.3/main.cpp

43
ex5.1/readfromstdin.cpp

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#include <iostream>
#include <iomanip>
int main() {
int input = 0;
std::cout << "Give me an Integer in hex: ";
std::cin >> std::hex >> input ;
std::cout << "Dec: " << input << std::endl;
std::cout << "Hex: " ;
std::cout << std::hex << input << std::endl;
std::cout << "Octal: " ;
std::cout << std::oct << input << std::endl;
float f1, f2, f3 ;
std::cout << "Give me three floats: " << std::endl;
std::cout << "f1: " ;
std::cin >> f1 ;
std::cout << "f2: " ;
std::cin >> f2 ;
std::cout << "f3: " ;
std::cin >> f3 ;
std::cout << "The following floats were given: " << std::endl;
std::cout << std::scientific << f1 << " " << f2 << " " << f3 << std::endl;
std::cout << "That is 20 chars columns per float: " << std::endl;
std::cout << std::setw(20) << "ValueA" << " " << std::setw(20) << "ValueB" << " "<< std::setw(20) << "ValueC" << std::endl;
std::cout << std::setfill('-') << std::setw(3*20 + 2 + 1) << " " << std::endl ;
std::cout << std::setfill(' ') << std::setw(20) << std::scientific << f1 << " " << std::setw(20) << f2 << " "<< std::setw(20) << f3 << std::endl;
std::cout << "With 3 digit precision: " << std::endl;
std::cout << std::left << std::setprecision(3) << std::scientific << f1 << " " << f2 << " " << f3 << std::endl;
}

35
ex5.2/main.cpp

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#include <fstream>
#include <iostream>
int main() {
std::ifstream fh("data1.txt");
if ( fh ) {
std::cout << "File opened OK" << std::endl;
}
else
{
std::cout << "Opening File Failed" << std::endl;
return 1;
}
int number ;
while(fh >> number) {
if ( number == 0 ) {
std::cout << "Found a Zero: Breaking Loop" << std::endl;
break;
}
std::cout << "Found number: " << number << std::endl;
if ( fh.eof() ) {
std::cout << "EOF" << std::endl;
break;
}
}
}

52
ex5.3/main.cpp

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#include <fstream>
#include <iostream>
#include <cstring>
#include <sstream>
int main( int argc, char* argv[] ) {
if ( argc != 2) {
std::cout << "usage: " << argv[0] << " FILENAME" << std::endl;
return 1;
}
std::ifstream fh(argv[1]);
if ( !fh ) {
std::cout << "Error opening File '" << argv[1] << "'" << std::endl;
return 2;
}
unsigned int linecount = 0;
unsigned int charcount = 0;
unsigned int wordcount = 0;
const int bufsize = 100;
char buf[bufsize];
const int linebufsize = 10;
char linebuf[linebufsize];
// if EOF, fh returns false
while( fh ) {
fh.getline(buf, bufsize);
charcount += strlen(buf)+1; // Newlines are not counted normally, but they are a character
linecount++;
std::istringstream line(buf);
while( line ) {
line >> linebuf;
wordcount++ ;
if ( line.eof() )
{
break ;
}
}
}
std::cout << " " << linecount-1 << " " << wordcount-1 << " " << charcount-1 << " " << argv[1] << std::endl;
}