Using getchar and putchar

[hey77]

Write a program that counts number of braces, brackets and parenthesis in
the standard input and tests where there are the,
same number of left braces, { , as right braces, } ;
same number of left brackets, [ , as right brackets, ] ;
same number of left parentheses, ( , as right parentheses, )

i am required to use the getchar and putchar funtions......but dont really understand how to use them, what would the code look like for one of the requirements?

[sicarie]

Write a program that counts number of braces, brackets and parenthesis in
the standard input and tests where there are the,
same number of left braces, { , as right braces, } ;
same number of left brackets, [ , as right brackets, ] ;
same number of left parentheses, ( , as right parentheses, )

i am required to use the getchar and putchar funtions......but dont really understand how to use them, what would the code look like for one of the requirements?

Here is a pretty good reference on getchar(), and here is one for putchar().

[hey77]

i got ti working just fine except now im having an issue
towards the end I need to declare whether the { and } are equal and not equal etc..... here is my code. everytime it says they are equal even if they are not.... what is wrong with the lastfew lines of code?

#include <iostream>
using namespace std;
int main ()
{
    int x, a = 0, b = 0,c = 0,d = 0,e = 0,f = 0;
    cout << " Enter characters in the standard input" <<endl;
    while (( x = getchar() ) != EOF )
    {
        putchar (x);
        if (x == '{' )
            a=a++;
        else if (x == '}' )
            b=b++;
        else if (x == ']' )
            c=c++;
        else if (x == '[' )
            d=d++;
        else if (x == '(' )
            e=e++;
        else if (x == ')' )
            f=f++;
        }
        cout << endl << "number of occurrences of { is " << a << endl;
        cout << endl << "number of occurrences of } is " << b << endl;
        cout << endl << "number of occurrences of ] is " << c << endl;
        cout << endl << "number of occurrences of [ is " << d << endl;
        cout << endl << "number of occurrences of ( is " << e << endl;
        cout << endl << "number of occurrences of ) is " << f << endl;
        if ( a=b)
            cout << "{ and } are equal!" <<endl;
        else if ( a !=b )
            cout << "{ and } are not equal!" << endl;
        if ( c=d)
            cout << "[ and ] are equal!" <<endl;
        else if (c!=d)
            cout << "[ and ] are not equal!" << endl;
        if ( e=f)
            cout << "( and ) are equal!" <<endl;
        else if (e!=f)
            cout << "( and ) are not equal!" << endl;
        return 0;
}

[sicarie]

I believe your problem lies at the end of your code.

        if ( a=b)
            cout << "{ and } are equal!" <<endl;
        else if ( a !=b )
            cout << "{ and } are not equal!" << endl;
        if ( c=d)
            cout << "[ and ] are equal!" <<endl;
        else if (c!=d)
            cout << "[ and ] are not equal!" << endl;
        if ( e=f)
            cout << "( and ) are equal!" <<endl;
        else if (e!=f)
            cout << "( and ) are not equal!" << endl;
        return 0;
}

You use single '=' several times. For conditional statements, you need '=='. The single is an assignment, and will give c d's value, and give e the value in f, etc...

[hey77]

you are exactly right.......thanks for your help!

[sicarie]

you are exactly right.......thanks for your help!

Any time, glad I could help!

[anel]

I had the same problem,but because of you guys i understand what was going wrong,thnx a lot,both of you...

[sicarie]

I had the same problem,but because of you guys i understand what was going wrong,thnx a lot,both of you...

Glad we could help, anel - please feel free to post if you run into any other problems.