c语言 7-5

1、

#include <stdio.h>

unsigned set_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        x = x | 1U << i;
    }
    return x;
}

unsigned reset_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        x = x & ~(1U << i);
    }
    return x;
}

unsigned inverse_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        x = x ^ 1U << i;
    }
    return x;
}

int main(void)
{
    unsigned x;
    int pos, n;
    puts("please intput the test number ,move bits, and range span.");
    printf("x = "); scanf("%u", &x);
    printf("pos = "); scanf("%d", &pos);
    printf("n = "); scanf("%d", &n);
    
    printf("set      1      = %u
", set_n(x, pos, n));
    printf("set      0      = %u
", reset_n(x, pos, n));
    printf("inverse         = %u
", inverse_n(x, pos, n));
    
    return 0;
}

2、

#include <stdio.h>

unsigned set_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        x = x | 1U << i;
    }
    return x;
}

unsigned reset_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        x = x & ~(1U << i);
    }
    return x;
}

unsigned inverse_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        if(x >> i & 1U)
            x = x & ~(1U << i);
        else
            x = x | 1U << i;
    }
    return x;
}

int main(void)
{
    unsigned x; int pos, n;
    puts("please input the test number pos span.");
    printf("x = "); scanf("%u", &x);
    printf("pos = "); scanf("%d", &pos);
    printf("n = "); scanf("%d", &n);
    
    printf("set       0        = %u
", set_n(x, pos, n));
    printf("set       1        = %u
", reset_n(x, pos, n));
    printf("inverse            = %u
", inverse_n(x, pos, n));
    
    return 0;
}

3、

#include <stdio.h>

unsigned set_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        x = x | 1U << i;
    }
    return x;
}

unsigned reset_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        if(x & 1U << i)
            x = x ^ 1U << i;
        else
            x = x;
    }
    return x;
}

unsigned inverse_n(unsigned x, int pos, int n)
{
    int i;
    for(i = pos; i <= pos + n - 1; i++)
    {
        x = x ^ 1U << i;
    }
    return x;
}

int main(void)
{
    unsigned x; int pos, n;
    puts("please input test number, pos and span.");
    printf("x = "); scanf("%u", &x);
    printf("pos = "); scanf("%d", &pos);
    printf("n = "); scanf("%d", &n);
    
    printf("set      1       = %u
", set_n(x, pos, n));
    printf("set      0       = %u
", reset_n(x, pos, n));
    printf("inverse          = %u
", inverse_n(x, pos, n));
    
    return 0;
}