1. Parallel Arrays
Parallel array =>Two or more arrays with the same number
of elements used for storing related information about a
collection of data.
Example:
int id[NUM_STUDENTS];
double gpa[NUM_STUDENTS];
The array id contains the id for each student.
The array gpa contains the gpa for each student.
id[0] represents the id for the first student.
gpa[0] represents the gpa for the first student.
The arrays are called parallel arrays because the data stored in id[i]
and gpa[i] relate to the ith student.

2. Parallel Arrays Example: int id[NUM_STUDENTS];
double gpa[NUM_STUDENTS];
id[0]
if[1]
id[2]
id[3]
id[4]
id[5]
3423
gpa[0]
gpa[1]
gpa[2]
gpa[3]
gpa[4]
gpa[5]
3.56
1254
3.65
4532
2.89
2341
1.99
1242
2.77
5673
3.45

3. Parallel Arrays
Assignment # 13: Ref. Election program posted on the Internet/
textbook.
Parallel Arrays are:
string name[100];
int age[100];

4. How to get the first character of a string
#include <iostream>
#include <string>
int main() {
string inputStr;
cin >> inputStr; // if you enter john, your program will display j
cout << inputStr . substr(0,1) <<endl;
return 0; }

5. How to get the first character of a string from an array of strings
#include <iostream>
#include <string>
int main() {
string inputStr[]={“John", "Robin"};;
cout << inputStr[0] . substr(0,1) <<endl;
return 0; }

6. How to get input from file and write to a file
#include <iostream>
#include <string>
#include <fstream>
#include <iomanip>
int main() {
string name[2];
ifstream inFile;
ofstream outFile;
inFile.open("c:\input.dat");

7. Continued if (!inFile) { cout << "Can't open it"; return 1; }
outFile.open("c:\output.dat");
inFile >> name[0] >> name[1];
//cout << name[0] <<endl;
//cout << name[1] <<endl;
outFile << name[0] << " "<< name[1];
return 0;