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#include <stdlib.h> #include <string> // for string, substring #include <sstream> // for stringstream #include <iostream> // for cout, puts etc. #include <stdio.h> // for sprintf, printf( "%lf\n", accum ); #include <time.h> // time #include <fcntl.h> // open() #include <unistd.h> // read() #include <iomanip> // for setw #include <fstream> // for ifstream using namespace std; // allows get rid of std:: prefix. |
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std::string s("121 151 225 456");
std::stringstream ss(s);
T val;
do { ss >> val; cout << val << endl; } while( ss.good() );
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Check if file exists
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#include <fstream> // for ifstream
std::ifstream f("file.txt");
if(not f.good()) ...
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Input from file value by value
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#include <fstream> // for ifstream std::ifstream f("file.txt"); std::string val; while (f>>val) { std::cout << "val: " << val << '\n'; } f.close(); |
Input from file line by line
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#include <fstream> // for ifstream
std::ifstream f("file.txt");
std::string line;
while (std::getline(f, line)) {
std::cout << "line: " << line << '\n';
}
f.close(); |
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Print long space or repeated character
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