void P6::Monochrome(const char* filename)
{
if (isGrayMonochrome() == true)
{
cout << "The image is already monochrome \n";
return;
}
else
{
char* newName = ChangeFileName(filename, "_monochrome.ppm");
ofstream outFile(newName, ios::out);
if (!outFile)
{
cerr << "Cannot write P6 file \n";
return;
}
char magic_pbm[3] = "P6";
outFile << magic_pbm << endl << getWidth() << " " << getHeight() << endl << getMaxNum() << endl;
int r = 0, g = 0, b = 0;
for (int i = 0; i < getHeight(); i++)
{
for (int j = 0; j < getWidth(); j++)
{
r = getPixels()[i][j].getRed();
g = getPixels()[i][j].getGreen();
b = getPixels()[i][j].getBlue();
int gray = grayscale(r, g, b);
int m = monochrome(gray);
outFile.write((const char*)&m, sizeof(char));
outFile.write((const char*)&m, sizeof(char));
outFile.write((const char*)&m, sizeof(char));
}
}
outFile.flush();
outFile.close();
delete[] newName;
}
}
int* majorityElement(int a[],int len)
{
if( a==NULL )
return NULL;
printf("the arrary size is %d \n",len);
int values[100] = {0}; //sotre the unique value
int times[100] ={0}; //times[i] store the number of times of values[i] appears.
int valueTail = 0; // indicate how many unique value.
int i= 0;
for( i=0;i< len;i++)
{
int j=0;
for(j=0; j<valueTail;j++)
{
if(a[i]==values[j])
{
times[j]++;
break;
}
}
if(j==valueTail)
{
values[valueTail]=a[i];
times[valueTail++]++;
}
}
for(i=0; i<valueTail;i++)
{
printf("the times arrary values is %d, times[%d]= %d \n",values[i],i,times[i]);
}
int max = getMaxNum(times,valueTail);
printf("the majority num is %d \n ", values[max]);
}