Breaking a single string into multiple strings C++?
I need to input 3 full names separated by commas
Full Name 1: John, Smith, Flynn
Full Name 2: Walter, Kennedy, Roberts Full Name 3: Sam, Bass, ClintonThen output it like this
First Name 1: John
First Name 2: Walter First Name 3: SamMiddle Name 1: Smith
Middle Name 2: Kennedy Middle Name 3: BassLast Name 1: Flynn
Last Name 2: Roberts Last Name 3: ClintonHow do i do these? so far this is my code
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int main () {
char first[3][100];
char middle[3][100];
开发者_JAVA技巧 char last[3][100];
char full[3][100];
int i;
cout << "Enter 3 Full Names <first, middle and last names separated by comma>:" << endl;
for (i=0; i<3; i++) {
cout << "Full Name " << i+1 << ":" ;
gets (full[i]);
}
cout << "The first names are: " << endl;
for (i=0; i<3; i++) {
strcpy (first[i], full[i]);
if (strcmp (first[i], ", ")) {
cout << "First Name "<< i+1 << ":" ;
strcpy ( first[i], full[i] );
cout << (first[i]);
cout << endl;
}
}
cout << "The middle names are: " << endl;
for (i=0; i<3; i++) {
cout << "Middle Name "<< i+1 << ":" ;
cout << (middle[i]);
cout << endl;
}
cout << "The last names are: " << endl;
for (i=0; i<3; i++) {
cout << "Last Name "<< i+1 << ":" ;
cout << (last[i]);
cout << endl;
}
system("pause");
return 0;
}
I think here what you want to is a split method for string class, the method should like this:
void SplitName(const string& fullName, const string& delims, vector<string>& names)
{
size_t i = 0;
size_t j = 0;
while (i < fullName.size())
{
i = fullName.find_first_not_of(delims, i);
j = fullName.find_first_of(delims, i);
if (i < fullName.size())
{
names.push_back(fullName.substr(i, j - i));
}
i = j;
}
}
you can define the ":," as delims, then names[1] is First Name, names[2] is Middle Name, names[3] is Last Name.
I'd probably do something like this:
Edit: after some thought, I've decided the duplication really did bother me too much, so I've eliminated it. I'm not sure it's technically allowed (std::string
isn't a POD) but it seems to work, and strikes me as nicer and more scalable.
#include <iostream>
#include <sstream>
#include <algorithm>
#include <string>
#include <vector>
#include <iterator>
struct name {
std::string first, middle, last;
};
std::istream &operator>>(std::istream &is, name &n) {
char ch;
is.ignore((unsigned)-1, ':');
is.ignore(1);
std::getline(is, n.first, ',');
std::getline(is, n.middle, ',');
std::getline(is, n.last);
return is;
}
struct item {
size_t offset;
char *caption;
};
void show(name const &n, item const &i) {
// as predicted, eliminating the duplication did lead to one gnarly line of code:
std::string &name = *(std::string *)((char *)&n+i.offset);
std::cout << i.caption << name << "\n";
}
int main() {
std::vector<name> names;
std::string raw_data("Full Name 1: John, Smith, Flynn\nFull Name 2: Walter, Kennedy, Roberts\nFull Name 3: Sam, Bass, Clinton");
std::istringstream infile(raw_data);
std::copy(std::istream_iterator<name>(infile),
std::istream_iterator<name>(),
std::back_inserter(names));
item items[] = {
{offsetof(name, first), "First Name: "},
{offsetof(name, middle), "Middle Name: "},
{offsetof(name, last), "Last name: "}
};
for (int i=0; i<3; i++) {
for (int j=0; j<3; j++)
show(names[j], items[i]);
std::cout << "\n";
}
return 0;
}
void DumpName(char* pBuffer, char cDelimiter, int iCounter);
int _tmain(int argc, _TCHAR* argv[])
{
char full[3][100];
cout << "Enter 3 Full Names <first, middle and last names separated by comma>:" << endl;
for (int i=0; i<3; i++) {
cout << "Full Name " << i+1 << ":" ;
gets (full[i]);
}
for(int i=0; i<3; i++)
{
cout << "First Name "<< i+1 << ":" ;
DumpName(full[i], ',', 0);
}
for(int i=0; i<3; i++)
{
cout << "Middle Name "<< i+1 << ":" ;
DumpName(full[i], ',', 1);
}
for(int i=0; i<3; i++)
{
cout << "Last Name "<< i+1 << ":" ;
DumpName(full[i], ',', 2);
}
return 0;
}
void DumpName(char* pBuffer, char cDelimiter, int iCounter)
{
int iFound = 0;
char* pStart = pBuffer;
char* pCurrent = pBuffer;
while(*pCurrent != '\0')
{
if(*pCurrent == cDelimiter)
{
if(iFound == iCounter)
{
*pCurrent = '\0';
cout << pStart << endl;
*pCurrent = cDelimiter;
return;
}
pStart = pCurrent;
pStart ++;
iFound ++;
}
pCurrent ++;
}
if((iCounter - iFound) == 0)
cout << pStart << endl;
}
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