c 语言7-4

1、

#include <stdio.h>

unsigned set(unsigned x, int pos)
{
    return x | 1U << pos;
}

unsigned reset(unsigned x, int pos)
{
    return x & (~(1U << pos));
}

unsigned inverse(unsigned x, int pos)
{
    if(x >> pos & 1U)
        return(x & (~(1U << pos)));
    else
        return(x | 1U << pos);
}

int main(void)
{
    unsigned x; int pos;
    puts("please input the test number and move bits.");
    printf("x = "); scanf("%u", &x);
    printf("pos = "); scanf("%d", &pos);
    
    printf("set    1      = %u
",     set(x, pos));
    printf("set    0      = %u
",   reset(x, pos));
    printf("set inverse   = %u
", inverse(x, pos));
    
    return 0;
}

2、

#include <stdio.h>

unsigned set(unsigned x, int pos)
{
    return x | 1U << pos;
}

unsigned reset(unsigned x, int pos)
{
    return x & ~(1U << pos);
}

unsigned inverse(unsigned x, int pos)
{
    return x ^ 1U << pos;    
} 

int main(void)
{
    unsigned x; int pos;
    puts("please input the test number and move bits.");
    printf("x = "); scanf("%u", &x);
    printf("pos = "); scanf("%d", &pos);
    
    printf("set      1      = %u
",    set(x, pos));
    printf("reset    0      = %u
",  reset(x, pos));
    printf("inverse         = %u
",inverse(x, pos));
    
    return 0;
}

3、

#include <stdio.h>

unsigned set(unsigned x, int pos)
{
    return x | 1U << pos;
}

unsigned reset(unsigned x, int pos)
{
    if(x & 1U << pos)
        return x ^ 1U << pos;
    else
        return x;
}

int inverse(unsigned x, int pos)
{
    return x ^ 1U << pos;    
} 

int main(void)
{
    unsigned x; int pos;
    puts("please input the test number and move bits.");
    printf("x = "); scanf("%u", &x);
    printf("pos = "); scanf("%d", &pos);
    
    printf("set       1     = %u
", set(x, pos));
    printf("reset     0     = %u
", reset(x, pos));
    printf("inverse         = %u
", inverse(x, pos));
    
    return 0;
}