Answer Question On Problem Solving For Programming.

Problem Solving and Programming Question C++?

You use = to make an assignment like
c = true //set c to be true

And you use == to compare

if (c==true) //do this is c is true

You used assignment in the while statement and in the if statement. That's probably all it is.

C++ Programming and Problem Solving Q?

Does mail.dat exist in the place you think it does?

I've just tried your program and it just loops around putting out nothing if mail.dat isn't in the folder you're running it from. For input you should check that the file has been opened before trying to read from it.

inData.open("mail.dat");
if (inData.fail())
{
cout << "Couldn't open the input file." << endl;
return -1;
}

For example.

Also, this line is horrible:

cout << s << '\n' << endl << outData << s << '\n';

endl is pretty much equivalent to '\n' so try not to mix the two. Also don't do output to two different file handles on one line use:

{
cout << s << endl << endl;
outData << s << 'endl;
}

Also define the open modes of your files:

inData.open("mail.dat", ios::in); // Open files
if (inData.fail())
{
cout << "Couldn't open the input file" << endl;
return -1;
}
outData.open("addresses.dat", ios::out);

Finally in your while condition you should check for end of file. See whole program below:

#include // For input, output
#include // For file input, output
#include // For text and .length and .find
using namespace std;

int main()
{
ifstream inData; //Define data
ofstream outData;

inData.open("mail.dat", ios::in); // Open files
if (inData.fail())
{
cout << "Couldn't open the input file" << endl;
return -1;
}
outData.open("addresses.dat", ios::out);

string s; // Define string

while (!inData.eof()) // Begin loop
{
inData >> s;
if (s.find('@') != std::string::npos) // Nest If with string.statements
{
cout << s << endl;
outData << s << endl;
}
else if (inData.fail())
cout << "File fail bit now set" << endl;
}
inData.close(); // Close files
outData.close();

return 0;
}

Where to find the answers for Problem Solving and Programming Concepts book?

I just bought a book called Problem Solving and Programming Concepts 9th version by Maureen Sprankle and Jim Hubbard.

There are many problems and question are there but there are no answers.

Can anyone help me find answers?

C++ programming for problem solving?

include
#include

void main()
{
clrscr();
int a[10],n,i,j;
int percent;
int count;
cout<<"
enter the size of array";
cin>>n;
cout<<"
enter the values";
for(i=0;i<=n-1;i++)
{
cout<<" a["< cin>>a[i];
}

for( i=0;i<=n-1;i++)
{ count=0;
for(j=0;j<=n-1;j++)
{ if(a[i]>a[j])
{
count=count+1;
}
}
percent=(count*100)/(n-1);
cout<<"

the percentile of"<<"a["< }
getch();

}

C++ programming - problem solving?

Write a program that will read in a weight in pounds and ounces and will output the equivalent weight in kilograms and grams. Use at least three functions: one for input, one or more for calculating, and one for output. Include a loop that lets the user repeat this computation for new input values until the user says he or she wants to end the program. There are 2.2046 pounds in kilogram, 1000 grams in a kilogram, and 16 ounces in a pound.