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Printer European Article Number 13 in Software STANDARD C++ STRINGS

STANDARD C++ STRINGS
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infile
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input.txt
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Twas brillig, and the slithy toves Did gyre and gimble in the wabe; All mimsy were the borogroves, And the mome raths outgrabe.
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output.txt outfile
ostream Twas Brillig, And The Slithy Toves Did Gyre And Gimble In The Wabe; All Mimsy Were The Borogroves, And The Mome Raths Outgrabe.
Notice that the program has four objects: an ifstream object named infile, an ofstream object named outfile, a string object named word, and a char object named c .
The advantage of using external files instead of command line redirection is that there is no limit to the number of different files that you can use in the same program. EXAMPLE 9.7 Merging Two Sorted Data Files
This program merges two files into a third file. The numbers stored in the files north.dat and south.dat are sorted in increasing order. The program reads these two input files simultaneously and copies all their data to the file combined.dat so that they are all together in increasing order:
north.dat fin1 n1 99
int ifstream
22 25 40 44 48 52 55 70 75 77 80 88 99 south.dat
fin2
ifstream
20 30 33 47 50 60 66 72 85
more1
false
bool
combined.dat fout
ofstream
more2
false
bool
20 22 25 30 33 40 44 47 48 50 52 55 60 66 70 72 75 77 80 85 88 99
bool more(ifstream& fin, int& n) { if (fin >> n) return true; else return false; } bool copy(ofstream& fout, ifstream& fin, int& n) { fout << " " << n; return more(fin, n); } int main() { ifstream fin1("north.dat"); ifstream fin2("south.dat"); ofstream fout("combined.dat"); int n1, n2; bool more1 = more(fin1, n1); bool more2 = more(fin2, n2);
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STANDARD C++ STRINGS
while (more1 && more2) if (n1 < n2) more1 = copy(fout, fin1, n1); else more2 = copy(fout, fin2, n2); while (more1) more1 = copy(fout, fin1, n1); while (more2) more2 = copy(fout, fin2, n2); fout << endl; } The more() function is used to read the data from the input files. Each call attempts to read one integer from the fin file to the reference parameter n. It returns true if it is successful, otherwise false. The copy() function writes the value of n to the fout file and then calls the more() function to read the next integer from the fin file into n. It also returns true if and only if it is successful. The first two calls to the more() function read 22 and 20 into n1 and n2, respectively. Both calls return true which allows the main while loop to begin. On that first iteration, the condition (n1 < n2) is false, so the copy() function copies 20 from n2 into the combined.dat file and then calls the more() function again which reads 30 into n2. On the second iteration, the condition (n1 < n2) is true (because 22 < 30), so the copy() function copies 22 from n1 into the combined.dat file and then calls the more() function again which reads 25 into n1. The next iteration writes 25 to the output file and then reads 40 into n1. The next iteration writes 30 to the output file and then reads 33 into n2. This process continues until 85 is written to the output file from n2 and the next call to more() fails, assigning false to more2. That stops the main while loop. Then the second while loop iterates three times, copying the last three integers from north.dat to combined.dat before it sets more1 to false. The last loop does not iterate at all. Note that file objects (fin1, fin2, fout) are passed to function the same way any other objects are passed. However, they must always be passed by reference.
9.6 STRING STREAMS A string stream is a stream object that allows a string to be used as an internal text file. This is also called in-memory I/O. String streams are quite useful for buffering input and output. Their types istringstream and ostringstream are defined in the <sstream> header file. EXAMPLE 9.8 Using an Output String Stream
This program creates four objects: a character string s, an integer n, a floating-point number x, and an output string stream oss: #include <iostream> #include <sstream> #include <string> using namespace std; void print(ostringstream&); int main() { string s="ABCDEFG"; int n=33; float x=2.718; ostringstream oss;
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