BigInt Project

[ADTR2012]

Well I'm kind of confused because in the directions for the project it says we have to use a "character array". Is that different than a string?

[Daleth]

A string of chars, an array of chars. Potato, potato... Err... You know what I mean.

[ADTR2012]

Gotcha. Another question. In my header file I have bigint(const char[]); and then when i define it I have

bigint::bigint(char number[]){
	
	
}

and it says no instance of overload function. Am I not defining it correctly?

[ADTR2012]

Nevermind I'm an idiot I forgot I had it as a const in the header..

[giblit]

I would use char *number
and not char number[] in your function


so it should be something maybe like this

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#include <iostream> const int MAX_SIZE = 3; class BigInt { public: BigInt( const char *value ); friend std::ostream &operator<<( std::ostream &stm , const BigInt &bi ); private: int value[ MAX_SIZE ]; }; BigInt::BigInt( const char *value ) { for( int i = 0; i < MAX_SIZE; ++i ) { this->value[ i ] = -'0' + *value++; this->value[ i ] = *value - '0'; ++value; } } std::ostream &operator<<( std::ostream &stm , const BigInt &bi ) { for( int i = 0; i < MAX_SIZE; ++i ) { stm << bi.value[ i ]; } return( stm ); } int main() { //char array[] = "123"; //BigInt bi1( array ); BigInt bi1( "123" ); std::cout << bi1 << std::endl; }

123 http://ideone.com/3KVcaw

*forgot link

[Daleth]

There's not much difference in this case whether you use a pointer to an array or use a pointer to an array (besides const-ness).

I would still pass in the size of the array as a second argument (or use template magic), so I can iterate according to the size of the array pointed to by the parameter.

for(size_t I(0); value[I] != '\0' && I < MAX_SIZE; ++I)
   arr1[I] = value[I] - '0';

I would also do some checking through the array in case the user tries entering "123.jhgw87\/246~-93||".

Edit:
Oh, but what I would prefer most is using std::string. :)