C++

Hi all... I need to write a C++ program saying
"Are you single or married? (s/m)?"
It needs to accept the 's' or 'm' in it's capital or lowercase form, using an if-else statement...and if a different letter is entered, such as a 'q', the output must read "invalid input, please re-enter." I can't do it, please post some help, ASAP. THanks.

 

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What about this?

<b>void</b> main(&nbsp; )
{
&nbsp;&nbsp;&nbsp;<b>char</b> var;
&nbsp;&nbsp;&nbsp;cout << "Are you single or married (s/m)?" << endl;
&nbsp;&nbsp;&nbsp;cin >> var;
&nbsp;&nbsp;&nbsp;var = tolower(var);
&nbsp;&nbsp;&nbsp;<b>while</b> (var != 'm' && var != 's')
&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cout << "Invalid input, please re-enter." << endl;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cin >> var;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var = tolower(var);
&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;<b>if</b> (var == 'm')
&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cout << "You are married." << endl;
&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;<b>else if</b> (var == 's')
&nbsp;&nbsp;&nbsp;{
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cout << "You are single." << endl;
&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;getch();
}

 

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ummm, I don't think we should be doing each other's homework here... shouldn't this be used more for specific questions like how the hardware talks to the software and other computer-related stuff?

I've programmed a tile based game engine in C++ so seriously, you gotta do your own work so it's 2nd nature by the time you do something big

 

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As someone who's been programming since the mid-70s, I tend to agree. If you have a problem, the very least you should do is post the code (segment) for feedback.

btw - interesting coding question:

• Given byte variables x and y,
• swap their contents without using a 3rd (temporary) variable.

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Given byte variables x and y,
swap their contents without using a 3rd (temporary) variable

Couldn't you make a pointer to them and make anytime thay are accessed make them hit the pointer and go to the other one?

It doesn't swap but it has the same effect!

 

#include <iostream.h>

void swap(int *a, int *b)
{
int *x = &a, *y = &b;
*a = y;
*b = x;

}
void main(void)
{
int a = 1, b = 2;

swab(&a, &b);

cout << a << " " << b << endl;
}

/* darnit, it seems simple until I do it. Then it seems impossible. I used 4 variables in the function... I seriously think there's a way to do this using memory addresses but have yet to figure that out. I will keep my brain occupied with this one in the near future.
*/

I could be cheap and use
void swap(int a, int b)
{
a = b;
b = ::a;
}
// but I don't count that as being very effective. Unless maybe there's a dynamic way to use externs with the same name, heh. (with the same name makes it kinda undynamic). Also ::a can count as a 3rd variable.

 

Swapping vars...

only for integers.

A ^= B;
B ^= A;
A ^= B;

or

A = A ^ B;
B = B ^ A;
A = A ^ B;


Example:
A 1101
B 0011

A = A ^ B;

A 1110
B 0011

B = B ^ A;

A 1110
B 1101

A = A ^ B;

A 0011
B 1101

-AntonK

 

Re: Swapping vars...

Outstanding!

 

void swap(int *a,int *b)
{
int c; // temp var
c = *a;
*a = *b;
*b = c;
}