c++ - howto: Read input and store it in another file -


i want make program reads highest value 1 file , stores in another. i've read ifstream , ofstream how let ofstream store highest value instream in file? here have far:

#include <iostream> #include <fstream> #include <string> #include <algorithm> #include <iterator> #include <vector>  using namespace std;  struct csvwhitespace : ctype<char> { static const mask* make_table() {     static vector<mask> v{classic_table(), classic_table() + table_size};     v[','] |=  space;  // comma classified whitespace     return v.data(); } csvwhitespace(size_t refs = 0) : ctype{make_table(), false, refs} {} }    csvwhitespace;  int main() { string line; ifstream myfile ("c:/users/username/desktop/log.csv");   ofstream myfile2 ("c:/users/username/desktop/log2.csv");   return 0; } auto v = vector<int>{}; myfile.imbue(locale{myfile.getloc(), &csvwhitespace}); copy(istream_iterator<int>{myfile}, istream_iterator<int>{}, back_inserter(v)); myfile2 << *max_element(begin(v), end(v)); }

thanks in advance :)

you copy 1 file in other, without having worry format, treating them in binary mode. here example:

#include <stdio.h> #include <string.h>  #define bufsize 1024  int main(int argc, char *argv[]) {   file *ifp, *ofp;   char buf[bufsize];   if (argc != 3)   {     fprintf(stderr,             "usage: %s <soure-file> <target-file>\n", argv[0]);     return 1;   }   if ((ifp = fopen(argv[1], "rb")) == null)   { /* open source file. */     perror("fopen source-file");     return 1;   }   if ((ofp = fopen(argv[2], "wb")) == null)   { /* open target file. */     perror("fopen target-file");     return 1;   }   while (fgets(buf, sizeof(buf), ifp) != null)   { /* while don't reach end of source. */     /* read characters source file fill buffer. */     /* write characters read target file. */     fwrite(buf, sizeof(char), strlen(buf), ofp);   }   fclose(ifp);   fclose(ofp);   return 0; }

which given example in ip, source. need specify cmd arguments desired files.


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