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#include<stdio.h>
#include<windows.h>
#define MAX(x,y) ((x)>(y)?(x):(y))
int main()
{
int a = 10;
int b = 20;
int max = 0;
max = MAX(a,b);
printf("max = %d\n",max);
system("pause");
return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<windows.h>

#define SWAP_ODD_EVEN( data ) \
( (((data)&0XAAAAAAAA) >> 1) | \
(((data)&0x55555555) << 1) \
)

int main( void )
{
int num = 100;
printf("%d\n", SWAP_ODD_EVEN(num));
system("pause");
return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include<windows.h>

int main( void )
{
int n, m;

printf("n, m:");
scanf("%d%d", &n, &m);

int xor = n ^ m;
int mask = 1;
int cnt = 0;
for ( ; xor; )
{
xor = xor & (xor-1);
cnt++;
}

printf("cnt=%d\n", cnt);
system("pause");
return 0;

}

#include <stdio.h>
#include <stdlib.h>

int find_data(int arr[][4], int row, int col, int data)
{
int i = 0;
int j = col - 1;

while ( 1 )
{
if ( data == arr[i][j] )
return 1;
else if ( data < arr[i][j] && j>0) {
j--;
} else if ( data >arr[i][j] && i<row-1) {
i++;
} else {
return 0;
}
}
}

int main( void )
{
int arr[4][4] = {
{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12},
{13,14, 15, 16}
};

int data;
scanf("%d", &data);

if ( find_data(arr, 4, 4, data) == 1 )
{
printf("found\n");
} else {
printf("not found\n");
}
}

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