Question

Please Update my C++ code:

Implement array to replace for vector:

Example --> input: 100 output: A

1000Pairs.txt looks like this:

{100, A }
{200, A }
{300, B }
{400, C }
{500, D }
{600, E }
{700, F }
{800, G }
{900, H }
{1000, I }
{1100, J }
{1200, K }
{1300, L }
{1400, M }
{1500, N }
{1600, O }
{1700, P }
{1800, Q }
{1900, R }
{2000, S }
{2100, T }
{2200, U }
{2300, V }
{2400, W }
{2500, X }
{2600, Y }
{2700, Z }
{2800, [ }
{2900, \ }
{3000, ] }
{3100, ^ }
{3200, _ }
{3300, ` }
{3400, a }
{3500, b }
{3600, c }
{3700, d }
{3800, e }
{3900, f }

and so on...

//Here is my code below:

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <vector>
#include <sstream>
using namespace std;

int main(){
ifstream inFile;
string s;
char a, b, c, d, e, f;
int num;
inFile.open("1000Pairs.txt");
if(!inFile){
cerr << "Unable to open file datafile.txt";
exit(1); // call system to stop
}
//Vector to store the data
vector<pair<int, char> > v;

while(getline(inFile, s)) {
string number;
for(int i = 1; i < s.length(); i++) {
if((s[i] ==' ') or (s[i] == '{') or (s[i] == '}'))
continue;
else if(s[i] >= '0' && s[i] <= '9') {
number += s[i];
}
else if(s[i] ==','){
//convert string to number
stringstream ss(number);
num = 0;
ss >> num;
//cout<<"num "<<num<<"\n";
}
else{
char d = s[i];
v.push_back(make_pair(num, d));
}

}

}
inFile.close();
/*for (int i = 0; i < v.size(); ++i)
{
cout<<v[i].first<<" "<<v[i].second<<endl;
}*/
int input;
cout<<"input: ";
cin>>input;
for (int i = 0; i < v.size(); ++i){
if(v[i].first == input) {
cout<<"output: "<<v[i].second<<endl;
}
}
return 0;
}

Answer 1

Here is code:

#include <iostream>

#include <fstream>

#include <cstdlib>

#include <vector>

#include <sstream>

using namespace std;

template <typename T>

T *incArray(T *arr, T newEle, int size)

{

T *newArr = (T *)malloc(sizeof(T) * (size + 1));

for (int i = 0; i < size; i++)

{

newArr[i] = arr[i];

}

newArr[size] = newEle;

return newArr;

}

int main() {

ifstream inFile;

string s;

char a, b, c, d, e, f;

int num,size = 0;

inFile.open("1000Pairs.txt");

if (!inFile) {

cerr << "Unable to open file datafile.txt";

exit(1); // call system to stop

}

//Vector to store the data

int *numbers;

char *chars;

while (getline(inFile, s)) {

string number;

for (int i = 1; i < s.length(); i++) {

if ((s[i] == ' ') or(s[i] == '{') or(s[i] == '}'))

continue;

else if (s[i] >= '0' && s[i] <= '9') {

number += s[i];

} else if (s[i] == ',') {

//convert string to number

stringstream ss(number);

num = 0;

ss >> num;

//cout<<"num "<<num<<"\n";

} else {

char d = s[i];

numbers = incArray(numbers, num, size);

chars = incArray(chars, d, size);

size++;

}

}

}

inFile.close();

/*for (int i = 0; i < v.size(); ++i)

{

cout<<v[i].first<<" "<<v[i].second<<endl;

}*/

int input;

cout << "input: ";

cin >> input;

for (int i = 0; i < size; ++i) {

if (numbers[i] == input) {

cout << "output: " << chars[i] << endl;

}

}

return 0;

}

1000Pairs.txt:

{100, A }
{200, A }
{300, B }
{400, C }
{500, D }
{600, E }
{700, F }
{800, G }
{900, H }
{1000, I }
{1100, J }
{1200, K }
{1300, L }
{1400, M }
{1500, N }
{1600, O }
{1700, P }
{1800, Q }
{1900, R }
{2000, S }
{2100, T }
{2200, U }
{2300, V }
{2400, W }
{2500, X }
{2600, Y }
{2700, Z }
{2800, [ }
{2900, \ }
{3000, ] }
{3100, ^ }
{3200, _ }
{3300, ` }
{3400, a }
{3500, b }
{3600, c }
{3700, d }
{3800, e }
{3900, f }

Output: