//--------------------------------------------------------- // Filename: FileLoop.cpp // // Purpose: Find the average of a list of values. The // values are read from a file. // // D. Searls // Asbury College // Sep 2006 //--------------------------------------------------------- #include <iostream> #include <iomanip> #include <fstream> using namespace std; int main() { string filename; // Name of input file int numValues; // Number of values double x; // A single value from list double sum; // Sum of values double avg; // The arithmetic average ifstream infile; // The input file // Get name of file cout << "Enter the name of the data file (test.dat): "; cin >> filename; cout << endl << endl; // Initialize sum and counter sum = 0.0; numValues = 0; // Read scores, maintaining a running total and counter infile.open(filename.c_str()); infile >> x; while (!infile.fail()) { numValues = numValues+1; sum = sum + x; infile >> x; } infile.close(); // Calculate average if (numValues > 0) { avg = sum/(double)numValues; } // Display results if (numValues > 0) { cout << "Number of scores read: " << numValues << endl; cout << "Sum of scores: " << sum << endl; cout << fixed << setprecision(2) ; cout << "Average score: " << avg; } else { cout << "The list contained no scores."; } cout << endl << endl; return 0; }
//--------------------------------------------------------- // This program converts a numeral representing a non- // negative integer to an integer type value. It also // converts a non-negative integer value to a string // representation (a numeral). // // D. Searls // Asbury College // Sep. 2006 //--------------------------------------------------------- #include <iostream> #include <string> using namespace std; int main() { string numeral; int integer; char ch; int digit; int position; cout << "Enter a non-negative integer value: "; cin >> numeral; cout << endl; // Convert a numeral (a string) to an integer integer = 0; position = 0; while(position < (int)numeral.length()) { ch = numeral.at(position); digit = int(ch) - int('0'); integer = 10 * integer + digit; position = position + 1; } cout << "The integer is " << integer << endl; // Convert an integer to a numeral (a string) numeral = ""; digit = integer % 10; integer = integer /10; ch = char(int('0') + digit); numeral = ch + numeral; while (integer > 0) { digit = integer % 10; integer = integer /10; ch = char(int('0') + digit); numeral = ch + numeral; } cout << "The numeral is \"" << numeral << '\"' << endl; return 0; }