c语言 7-2

 

1、

#include <stdio.h>
#include <math.h>

int main(void)
{
    unsigned x;
    int n;
    puts("please input an unsigned number and an integer.");
    printf("x = "); scanf("%u", &x);
    printf("n = "); scanf("%d", &n);
    
    (x << n) == x * (int)pow(2, n) ? printf("equally.\n") : printf("unequally.\n");
    (x >> n) == x / (int)pow(2, n) ? printf("equally.\n") : printf("unequally.\n");
    
    return 0;
}

 

2、

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

int main(void)
{
    unsigned x;
    int n;
    puts("please input an unsigned number and an integer.");
    printf("x = "); scanf("%u", &x);
    printf("n = "); scanf("%d", &n);
    
    int left = x << n;
    int leftve = x;
    int i;
    for(i = 1; i <= n; i++)
    {
        leftve *= 2;
    }
    if(left == leftve)
        puts("left equally.");
    else
        puts("left unequally.");
        
    int right = x >> n;
    int rightve = x;
    for(i = 1; i <= n; i++)
    {
        rightve /= 2;
    }
    if(right == rightve)
        puts("right equally");
    else
        puts("right unequally");
            
    return 0;
}

 

3、

#include <stdio.h>
#include <limits.h>

int main(void)
{
    unsigned x;
    puts("please input an unsigned integer.");
    do
    {
        printf("x = "); scanf("%u", &x);
        if(x > UINT_MAX)
            puts("It's too big!");
    }
    while(x > UINT_MAX);
    
    printf("verify left move 3 unit:  %u = %u\n", x << 3, x * 2 * 2 * 2);
    printf("verigy right move 3 unit:  %u = %u\n", x >> 3, x / 2 / 2 / 2);
    
    return 0;
}

 

4、

#include <stdio.h>

int main(void)
{
    unsigned x;
    int n;
    puts("please input an unsigned integer and integer.");
    printf("x = "); scanf("%u", &x);
    printf("n = "); scanf("%d", &n);
    
    int left = x, left_verify = x;
    left <<= n;
    printf("left = %u\n", left);
    int i;
    for(i = 1; i <= n; i++)
    {
        left_verify *= 2;
    }
    printf("left_vefigy = %u\n", left_verify);
    
    return 0;
}

 

 

#include <stdio.h>

int main(void)
{
    unsigned x;
    int n;
    puts("please input an unsigned integer and an integer.");
    printf("x = "); scanf("%u", &x);
    printf("n = "); scanf("%d", &n);
    
    int right = x, right_verify = x;
    right >>= n;
    printf("right    = %u\n", right);
    int i;
    for(i = 1; i <= n; i++)
    {
        right_verify /= 2;    
    } 
    printf("right_verify = %u\n", right_verify);
    
    return 0;
}