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Join Date: Sep 2005
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Newbie Poster
Having trouble passing bool type to function....need help Im having trouble sending a bool type to a function which returns a char string to a string.
I have provided the code below
Im using Bloodshed DevC++ 4.9.9.2
Your help will be greatly appreciated.
Cheers Toshkin!!!
I have provided the code below
/*
Name: bool2.cpp
Copyright:
Author: Toshkin
Date: 06/09/05 21:56
Description: passing string to boolean function returning boolean to
*/
#include <iostream>
#include <cstring>
using namespace std;
bool inout(char *string); // function prototype
char outin(char *string,bool *bl); //
int main()
{
char str1[5];
bool b;
cout <<"Please enter the word \"in\" or \"out\": ";
cin >>str1;
/*if (strcmp (str1,"in") == 0) { // redundant code....
b = true;
}
else {
b = false;
}
*/
b = inout(str1);
cout << boolalpha << b << endl;
cout <<"str1: "<<str1<<endl;
outin(str1,b);
cout <<"str1: "<<str1<<endl;
system("PAUSE");
return 0;
}
bool inout(char *string) // this works
{
if (strcmp(string,"in") == 0){
return true;
}
else if (strcmp(string,"out") == 0){
return false;
}
} // end inout
char outin(char *string,bool *bl) // this doesn't work
{
if (bl==1){
string = "in";
}
else if (bl==0) {
string = "out";
}
return string;
}Im using Bloodshed DevC++ 4.9.9.2
Your help will be greatly appreciated.
Cheers Toshkin!!!
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Join Date: Apr 2004
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You can't return arrays in C or C++. Nor can you copy arrays using assignment [edit]use strcpy to copy strings[/edit]. Is there some reason you aren't using std::string?
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Join Date: Jun 2005
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Newbie Poster
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Originally Posted by Toshkin78
Im having trouble sending a bool type to a function which returns a char string to a string.
I have provided the code below
char outin(char *string,bool *bl) // this doesn't work { if (bl==1){ string = "in"; } else if (bl==0) { string = "out"; } return string; }
Im using Bloodshed DevC++ 4.9.9.2
Your help will be greatly appreciated.
Cheers Toshkin!!!
since you are passing the string in by pointer and not by value, you can directly alter the string in the function... however you can not simply do string = whatever... you need to do a strcpy(string, whatever) or if you want, use stricpy(string, whatever, length) and then remember to put the null terminator at the end... then your function doesn't need to return anything... both strcpy and stricpy are in <cstring> and you'll need to #include that
also when comparing a bool to a value you can simply write true or false instead of 0 and 1... works better for clarity purposes... makes it easier to read
hope this helps
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Originally Posted by drock9975
both strcpy and stricpy are in <cstring>
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Join Date: Aug 2005
Location: near St Louis, Missouri, USA
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This will work -- the function must return char* which is a pointer just like the parameter. But there is no point passing the parameter if the function is going to change and return the pointer.
This would be more logical. And why are you passing the bool by reference instead of by value? The function isn't changing the value so you might as well pass by value.
char* outin(char *string,bool *bl)
{
if (bl==1){
string = "in";
}
else if (bl==0) {
string = "out";
}
return string;
}This would be more logical. And why are you passing the bool by reference instead of by value? The function isn't changing the value so you might as well pass by value.
char* outin(bool bl)
{
char* string = 0;
if (bl==1){
string = "in";
}
else if (bl==0) {
string = "out";
}
return string;
} 
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