C语言实现字符串循环左移和右移

C语言实现循环左移和右移

这个没有什么好说的，直接上代码：

#include <stdio.h>

//写一个函数 实现功能：输入字符串，向右循环或者逆时针移动N字节，再输出这个字符串
/*
    //比如：左移2字节
    //左边不变，右边变
    p[0] = s[4];  //LEN - (n - i)%LEN i = 0
    p[1] = s[5];  //LEN - (n - i)%LEN i = 1
    p[2] = s[0];  //LEN - (n - i)%LEN i = 2
    p[3] = s[1];  //LEN - (n - i)%LEN i = 3
    p[4] = s[2];  //
    p[5] = s[3];  //
    //右边不变，左边变
    p[2] = s[0];  //a   len - (n - i)%LEN i = 0
    p[3] = s[1];  //b                     i = 1
    p[4] = s[2];  //c                     i = 2
    p[5] = s[3];  //d                     i = 3
    p[0] = s[4];  //e  len -                    i = 4
    p[1] = s[5];  //f                     i = 5
    
    p[(n + i)%LEN] = src[i];
    
    //比如：左移5字节
    
    p[0] = s[1];  //len - (n - 0)%LEN   i = 0
    p[1] = s[2];  //len - (n - 1)%LEN   i = 1
    p[2] = s[3];  //len - (n - 2)%LEN   i = 2
    p[3] = s[4];  //len - (n - 3)%LEN   i = 3
    p[4] = s[5];  //len - (n - 4)%LEN   i = 4
    p[5] = s[0];  //len - (n - 5)%LEN   i = 5
    
    
    
*/
//左边不变，右边变
void ClockWise1(const char* src,char* result,int n)
{
    const unsigned int LEN = strlen(src);
    int i;
    n = n%LEN;
    for(i = 0;i < LEN;i++)
    {
        result[i] = src[(LEN - (n - i))%LEN];
    }
    result[i] = '\0';   
} 
//右边不变，左边变
void ClockWise2(const char* src,char* result,int n)
{
    const unsigned int LEN = strlen(src);
    int i;
    for(i = 0;i < LEN;i++)
    {
        result[(n + i)%LEN] = src[i];
    }  
    result[i] = '\0';   
}

void ClockWise3(const char* src,char* result,int n)
{
    const unsigned int LEN = strlen(src);
    int i;
    n = n%LEN;
    for(i = 0;i < n;i++)//也可以用strcy代替，下面函数就是
    {
        result[i] = src[LEN - n + i];
    } 
    for(i = 0;i < LEN - n;i++)
    {
        result[n + i] = src[i];
    }
    result[LEN] = '\0';   
}  
void ClockWise4(const char* src,char* result,int n)
{
    const unsigned int LEN = strlen(src);
    int i;
    n = n%LEN;
    strcpy(result,src + LEN - n);
    strcpy(result + n,src);
    result[LEN] = '\0';   
}
//写一个函数 实现功能：输入字符串，向左循环或者顺时针移动N字节，再输出这个字符串
/*
    //比如：左移移2字节
    //左边不变，右边变
    p[0] = s[2];  //(n + i)%LEN
    p[1] = s[3];  
    p[2] = s[4];  
    p[3] = s[5];  
    p[4] = s[0];  
    p[5] = s[1];  
    //右边不变，左边变
    p[5] = s[0];  //b (LEN - n + i)%LEN   i = 0
    p[0] = s[1];  //c                     i = 1
    p[1] = s[2];  //d                     i = 2
    p[2] = s[3];  //e                     i = 3
    p[3] = s[4];  //f               i = 4
    p[4] = s[5];  //a                     i = 5
    
    //比如：左移5字节
    
    
*/   
void AntiClockWise1(const char* src,char* result,unsigned int n)
{
    const unsigned int LEN = strlen(src);
    int i;
    for(i = 0;i < LEN;i++)
    {
        result[i] = src[(n + i)%LEN]; 
    }
    result[i] = '\0';
}  
void AntiClockWise2(const char* src,char* result,unsigned int n)
{
    const unsigned int LEN = strlen(src);
    int i;
    n = n%LEN;
    for(i = 0;i < LEN;i++)
    {
        result[(LEN - n + i)%LEN] = src[i];
    }
    result[i] = '\0';
} 
void AntiClockWise3(const char* src,char* result,unsigned int n)
{
    const unsigned int LEN = strlen(src);
    int i;
    n = n%LEN;
    for(i = 0;i < n;i++)
    {
        result[LEN - n + i] = src[i];
    }
    for(i = 0;i < LEN - n;i++)
    {
        result[i] = src[n + i];
    } 
    result[LEN] = '\0'; 
}    
int main()
{
    char result[255] = {0};
    printf("ClockWise1 start\n");
    ClockWise1("abcdef",result,3);
    printf("%s\n",result);
    ClockWise1("abcdef",result,5);
    printf("%s\n",result);
    ClockWise1("abcdef",result,8);
    printf("%s\n",result);
    ClockWise1("abcdef",result,12);
    printf("%s\n",result);   
    printf("ClockWise1 end\n\n");
    
    printf("ClockWise2 start\n");
    ClockWise2("abcdef",result,3);
    printf("%s\n",result);
    ClockWise2("abcdef",result,5);
    printf("%s\n",result);
    ClockWise2("abcdef",result,8);
    printf("%s\n",result);
    ClockWise2("abcdef",result,12);
    printf("%s\n",result);   
    printf("ClockWise2 end\n\n");
    
    printf("ClockWise3 start\n");
    ClockWise3("abcdef",result,3);
    printf("%s\n",result);
    ClockWise3("abcdef",result,5);
    printf("%s\n",result);
    ClockWise3("abcdef",result,8);
    printf("%s\n",result);
    ClockWise3("abcdef",result,12);
    printf("%s\n",result);   
    printf("ClockWise3 end\n\n");
    
    printf("ClockWise4 start\n");
    ClockWise4("abcdef",result,3);
    printf("%s\n",result);
    ClockWise4("abcdef",result,5);
    printf("%s\n",result);
    ClockWise4("abcdef",result,8);
    printf("%s\n",result);
    ClockWise4("abcdef",result,12);
    printf("%s\n",result);   
    printf("ClockWise4 end\n\n");
    
    printf("AntiClockWise1 start\n");
    AntiClockWise1("abcdef",result,3);
    printf("%s\n",result);
    AntiClockWise1("abcdef",result,5);
    printf("%s\n",result);
    AntiClockWise1("abcdef",result,8);
    printf("%s\n",result);
    AntiClockWise1("abcdef",result,12);
    printf("%s\n",result);   
    printf("AntiClockWise1 end\n\n");   
    
    printf("AntiClockWise2 start\n");
    AntiClockWise2("abcdef",result,3);
    printf("%s\n",result);
    AntiClockWise2("abcdef",result,5);
    printf("%s\n",result);
    AntiClockWise2("abcdef",result,8);
    printf("%s\n",result);
    AntiClockWise2("abcdef",result,12);
    printf("%s\n",result);   
    printf("AntiClockWise2 end\n\n"); 
    
    printf("AntiClockWise3 start\n");
    AntiClockWise3("abcdef",result,3);
    printf("%s\n",result);
    AntiClockWise3("abcdef",result,5);
    printf("%s\n",result);
    AntiClockWise3("abcdef",result,8);
    printf("%s\n",result);
    AntiClockWise3("abcdef",result,12);
    printf("%s\n",result);   
    printf("AntiClockWise3 end\n\n");
    return 0;
}

没打印完，你们可以自己调试看下

参考资料《狄泰软件C语言进阶》