Ex5: Input Streams

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;
+}

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;
+		}
+	}
+
+
+}

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;
+}