I want to set an integer to zero when it easy equal to another integer, but it seems that the program for some reason won't set the integer to zero. Here is the example of that code:
#include <iostream>
using namespace std;
int main () {
int n = 2;
int r = 2;
if(n==r)
n++;
r*0;
cout << " n is " << n << endl;
cout << " r is " << r << endl;
}
What am I doing wrong, it should say that "n is 3" and "r is 0".
I want to declare a 2D 4*4 array, and fills the array with the multiplication table of an integer x from the user, for example: x*1,x*2,x*3, ....., x*16 and how to pass that array to a function to print the array and to another function that swaps a column with another column chosen by the user.
I'm trying to solve Project Euler 16 where you have to calculate 2^1000. SO I made a program that would solve multiplying a number b a single digit factor through manual multiplication in a vector, just to test things out.
The problem is when I take things out of main and try to make a separate function, the original number is never multiplied.
Here's my code with functions...
/*Using vectors manually to multiply a number to a positive power.*/ #include <iostream> #include <vector> using namespace std; void print_vector(const vector<int>& v);
[code]....
Here is the other code, not using functions but even if I use an extra for loop to multiply by the same factor several times, it still does the same thing.
/*Using vectors manually to multiply a number by two (or any single digit factor).*/ #include <iostream> #include <vector> using namespace std; void print_vector(const vector<int>& v);
I am trying to read two matrices from individual .txt file, and later trying to multiply them. But I am unable to succeed.
Here is the code.
#include<stdio.h> #include<stdlib.h> #include<stdbool.h> // Here starts the main int main() { // The two input values FILE *inputFile1; FILE *inputFile2;
[Code] .....
I am able to get only the first values as the output. The first matrix is 5x3, and the second one is a 3x3 matrix.
Matrix 1 1 2 3 4 5 6 7 8 9 10 11 12
Matrix 2 1 2 3 4 5 6 7 8 9
The output which I am getting is
Enter File name of matrix #1 - with extention - : matrix1.txt Enter File name of matrix #2 - with extention - : matrix2.txt Rows1 = 1 Cols1 = 2 Rows2 = 1 Cols2 = 2Cant multiply those two matrices
I am writing a brute force implementation of matrix multiplication:
Header file:
vector<vector<int> > matrix_multiplication(vector <vector<int> >& a, vector <vector<int> >& B)/>/>/>;
Source file:
vector<vector<int> > matrix_multiplication(vector <vector<int> >& a, vector <vector<int> >& B)/>/>/>{ int n = a.size(); vector< vector <int> > c (n , vector<int> (n)); for (int i =0 ; i<n ; i++){ for (int j =0 ; j < n ; j++){ for (int k ; k < n ; k++){ c[i][j] = a[i][k] + b[k][j];
[Code] ....
I keep on getting occasional seg faults />/>. I can't see why.
I just started Linear Algebra for my programming degree and to full understand everything I want to put it into code and make my own "matrix calculator." I have all the theory but I am having issues keeping the matrix variable and moving it around the class' functions to create it and output it. Once I know I have it saved I think I can get the addition/multiplication to work. Here is the code I have so far:
#include <string> #include <iostream> using namespace std; class matrix {
I already have the standard one that mimics the one taught in schools written but I've found that there is a faster formula that can be used however I not sure how to implement this. The formula is called the "Fast Fourier Transform", any simplistic example using this function base:
typedef unsigned int uint; typedef unsigned char uchr; uint umul( uint* src, uint val ) { uint des = *src;
[Code] ....
If you're doing the buffer based functions then I have some pre-made functions you may need. [URL]
I have made a Biginteger class that performs multiplication operation according to Karatsuba's algorithm. But it seems that the code is not working perfectly.In the class I have made a function named karatsuba(BigInteger a1, BigInteger b1)that performs the Multilplication operation. There might be problems in this function as I have tried to store the original digits(neglecting the leading zeros) of the two big integer values into two integers or there might be problems in somewhere else. corrected version of this function? My code is given below:
