C语言第四次作业

发布在 C语言

第一题

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#include <stdio.h>;
void swap(int *a, int *b);
int main (void)
{
    int number[10];
    int i, j;//循环变量
    while (scanf("%d", &amp;number[0]) != EOF)
    {
        for (i = 1 ; i &lt; 10 ; i++)
            scanf("%d", &amp;number[i]);
        for (i = 0 ; i &lt; 9 ; i++)
        {
            for (j = 0 ; j &lt;= 8 - i ; j++)
            {
                if (number[j] &gt; number[j+1])
                    swap(&amp;number[j], &amp;number[j+1]);
            }
        }
        for (i = 0 ; i &lt; 10 ; i++)
        {
            if (i != 0) printf("-&gt;");
            printf("%d", number[i]);
        }
        putchar('\n');
    }
    return 0;
}
void swap(int *a, int *b)
{
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
    return;
}

第二题

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#include <stdio.h>;
int main (void)
{
    long number;
    char currentByte;
    int count;
    while (scanf("%ld", &amp;number) != EOF)
    {
        for (count = 7 ; count &gt;= 0 ; count--)
        {
            currentByte = (((0xf &lt;&lt; (count * 4)) &amp; number) &gt;&gt; (count * 4)) &amp; 0xf;
            printf("%hd(%c) ", currentByte, currentByte);
        }
        putchar('\n');
    }
    return 0;
}

第三题

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#include <stdio.h>;
void swapArray(int a[], int n);
void swap(int *a, int *b);
int main (void)
{
    int number[100];
    int totalNumber, individualNumber;
    int count, i;//循环变量
    scanf("%d", &amp;totalNumber);
    for (count = 0 ; count &lt; totalNumber; count++)
    {
        scanf("%d", &amp;individualNumber);
        for (i = 0 ; i &lt; individualNumber ; i++)
            scanf("%d", &amp;number[i]);
        swapArray(number, individualNumber);
        for (i = 0 ; i &lt; individualNumber ; i++)
        {
            if (i != 0) putchar(' ');
            printf("%d", number[i]);
        }
        putchar('\n');
    }
    return 0;
}
void swapArray(int a[], int n)
{
    int startIndex = 0;
    int endIndex = n - 1;
    while (startIndex &lt;= endIndex)
    {
        swap(&amp;a[startIndex], &amp;a[endIndex]);
        startIndex++;
        endIndex--;
    }
    return;
}
void swap(int *a, int *b)
{
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
    return;
}

第四题

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#include <stdio.h>;
void swap(int *a, int *b);
void moveArray(int a[], int n, int m);//轮移数组,其中n为总个数,m为轮移次数
int main (void)
{
    int number[22];
    int individualNumber, middleNumber;
    int i;//循环变量
    while ((scanf("%d", &amp;individualNumber), individualNumber) != 0)
    {
        scanf("%d", &amp;middleNumber);
        for (i = 0 ; i &lt; individualNumber ; i++)
            scanf("%d", &amp;number[i]);
        moveArray(number, individualNumber, middleNumber);
        for (i = 0 ; i &lt; individualNumber ; i++)
        {
            if (i != 0) putchar(' ');
            printf("%d", number[i]);
        }
        putchar('\n');
    }
    return 0;
}
void moveArray(int a[], int n, int m)
{
    if (m == 0)
    {
        return;
    }
    else
    {
        int temp, count;
        temp = a[0];
        for (count = 0 ; count &lt; n - 1 ; count++)
            a[count] = a[count+1];
        a[n-1] = temp;
        moveArray(a, n, --m);
    }
}
void swap(int *a, int *b)
{
    int temp;
    temp = *a;
    *a = *b;
    *b = temp;
    return;
}

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iOS学习笔记（一）

发布在 iOS开发

最近开始了自己的第一个项目，到目前为止已经写完了基本的界面，将开发过程中遇到的一些问题列举如下：

自定义cell分割线

首先设置 tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

然后在自定义的cell的实现文件内实现如下的方法

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- (void)drawSeparator{
    _separatorlineLayer = [CAShapeLayer layer];
    CGMutablePathRef separatorShapePath = CGPathCreateMutable();
    [_separatorLayer setFillColor:[UIColor clearColor].CGColor];
    [_separatorLayer setStrokeColor:[UIColor headlineColor].CGColor];
    _separatorLayer.lineWidth = 0.5f;
    CGPathMoveToPoint(separatorShapePath, NULL, 0.0f, 0.0f);
    CGPathAddLineToPoint(separatorShapePath, NULL, WIDTH, 0.0f);
    [_headlineLayer setPath:separatorShapePath];
    CGPathRelease(separatorShapePath);
    [self.contentView.layer addSublayer:_separatorLineLayer];
}

其中，_separatorLayer是CAShapeLayer的实例，setStrokeColor方法设定了线的颜色，CGPathMoveToPoint和CGPathAddLineToPoint设定了线的起始点。

同理，可以类似地实现画点或者更为复杂形状的效果。

iOS8之后cell的动态高度计算

首先使用autolayout布局，且确保cell的contentView至少top和bottom都和cell内部的View建立了约束。之后添加如下代码

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tableView.estimatedRowHeight = 60.0f;
tableView.rowHeight = UITableViewAutomaticDimension;

需要注意的是，必须要为tebleView的estimiatedRowHeight属性设定值。

返回键盘的高度

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- (void)viewDidLoad{
    [super viewDidLoad];
    //注册通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)dealloc {
    //移除通知
    [[NSNotificationCenter defaultCenter]removeObserver:self];
}

- (void)keyboardWillShow:(NSNotification *)notification{
    //键盘弹出时调用
    NSDictionary * userInfo = [notification userInfo];
    NSValue * frameValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardRect = [frameValue CGRectValue];
    NSInteger height = keyboardRect.size.height;
}

- (void)keyboardWillHide:(NSNotification *)notification{
    //键盘隐藏时调用
}

height中储存的即为当前键盘的高度

小心block导致的retain cycle

如果在block中需要访问本类的实例变量，需要使用

__weak UIViewController * weakSelf = self;

self持有了block，而block通过捕获self来访问实例变量，导致保留换的产生，通过__weak打破保留环。

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C语言第三次作业

发布在 C语言

第一题 C语言成绩

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#include<stdio.h>
#include<string.h>
void swap(int *score_a, int *score_b, char *name_a, char *name_b);
int main (void)
{
    int number, count;
    while (scanf("%d", &number) != EOF)
    {
        putchar('\n');
        int scores[number];
        char names[number][81];
        for (count = 0 ; count < number ; ++count)
            scanf("%s%d", names[count], &scores[count]);
        int i, j;
        for (i = 0 ; i < number ; ++i)
            for (j = i ; j < number ; ++j)
                if (scores[i] < scores[j])
                    swap(&scores[i], &scores[j], &names[i][0], &names[j][0]);
        for (count = 0 ; count < number ; ++count)
            printf("%s %d\n", names[count], scores[count]);
        putchar('\n');
    }
    return 0;
}

void swap(int *score_a, int *score_b, char *name_a, char *name_b)
{
    int t;
    char str_t[81];
    t = *score_a;
    *score_a = *score_b;
    *score_b = t;
    strcpy(str_t, name_a);
    strcpy(name_a, name_b);
    strcpy(name_b, str_t);
    return;
}

第二题 冒泡排序

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#include <stdio.h>
int main(void)
{
    int sequence[10];
    int count;
    int i, j;
    int temp;
    while (scanf("%d", &sequence[0]) != EOF)
    {
        for (count = 1 ; count < 10 ; ++count)
            scanf("%d", &sequence[count]);
        for (i = 0 ; i < 10 ; ++i)
        {
            for (j = 0 ; j < 8 - i ; ++j)
            {
                if (sequence[j] > sequence[j+1])
                {
                    temp = sequence[j];
                    sequence[j] = sequence[j+1];
                    sequence[j+1] = temp;
                }
            }
        }
        for(count = 0 ; count < 10 ; ++count)
            printf("%d ", sequence[count]);
        putchar('\n');
    }
    return 0;
}

第三题 n人报数（此题可查找“约瑟夫问题”）

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#include <stdio.h>
int main (void)
{
    int number,count;
    int current;
    int i;
    while (scanf("%d", &number) != EOF)
    {
        int people[10000];
        for (i = 0 ; i < number ; ++i)
            people[i] = 1;
        count = number;
        current = 0;
        i = 0;
        while (count > 1)
        {
            if (i >= number)
                i = 0;
            if (people[i] == 1)
                current += 1;
            if (count == 1)
                break;
            if (current == 3)
            {
                people[i] = 0;
                count -= 1;
                current = 0;
            }
            i++;
        }
        for (i = 0 ; i < number ; ++i)
            if (people[i] == 1)
            {
                printf("%d\n", i + 1);
                break;
            }
    }
    return 0;
}

第四题 定义宏交换参数

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#include <stdio.h>
#define Swap(x,y) {x = x + y; y = x - y; x = x - y;}

int main (void)
{
    int a, b;
    int count = 0;
    while (scanf("%d%d", &a, &b) != EOF)
    {
        if (count)
            putchar('\n');
        count += 1;
        printf("Case %d:\n", count);
        printf("Before Swap:a=%d b=%d\n", a, b);
        Swap(a,b);
        printf("After Swap:a=%d b=%d\n", a, b);

    }
    return 0;
}

第五题 字符串复制

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#include <stdio.h>
void mycpy (char s[], char t[], int n);
int main (void)
{
    int number;
    char sentence[1001];
    char result[1001];
    int n;
    scanf("%d", &number);
    getchar();//读取\n
    int count;
    for (count = 0 ; count < number ; ++count)
    {
        fgets(sentence, 1001, stdin);
        scanf("%d", &n);
        getchar();//读取\n
        mycpy(result, sentence, n);
        printf("%s\n", result);
    }
    return 0;
}
void mycpy (char s[], char t[], int n)
{
    int i;
    for (i = 0 ; i < n ; ++i)
    {
        s[i] = t[i];
    }
    s[n] = '\0';
    return;
}

第六题 统计

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#include <stdio.h>
int main (void)
{
    char currentChar;
    int numberCount[10] = {0};
    int englishCharCount = 0;
    int otherCount = 0;
    int count;
    while ((currentChar = getchar()) != EOF)
    {
        switch (currentChar)
        {
            case '0': numberCount[0] += 1 ; break;
            case '1': numberCount[1] += 1 ; break;
            case '2': numberCount[2] += 1 ; break;
            case '3': numberCount[3] += 1 ; break;
            case '4': numberCount[4] += 1 ; break;
            case '5': numberCount[5] += 1 ; break;
            case '6': numberCount[6] += 1 ; break;
            case '7': numberCount[7] += 1 ; break;
            case '8': numberCount[8] += 1 ; break;
            case '9': numberCount[9] += 1 ; break;
            default: break;
        }
        if ((currentChar >= 'A' && currentChar <= 'Z') || (currentChar >= 'a' && currentChar <= 'z'))
            englishCharCount += 1;
        else if (!(currentChar >= '0' && currentChar <= '9'))
            otherCount += 1;
    }
    for (count = 0 ; count < 10 ; ++count)
        printf("Number %d: %d\n", count, numberCount[count]);
    printf("characters: %d\n", englishCharCount);
    printf("other: %d\n", otherCount);
    return 0;
}

第七题 选择排序

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#include <stdio.h>
int main (void)
{
    int sequence[20];
    int number;
    int count;
    int i, j;
    int temp;
    while (scanf("%d", &number), number != 0)
    {
        for (count = 0 ; count < number ; ++count)
            scanf("%d", &sequence[count]);
        for (i = 0 ; i < number ; ++i)
            for (j = i ; j < number ; ++j)
                if (sequence[i] > sequence[j])
                {
                    temp = sequence[i];
                    sequence[i] = sequence[j];
                    sequence[j] = temp;
                }
        for (count = 0 ; count < number ; ++count)
        {
            if (count)
                putchar(' ');
            printf("%d", sequence[count]);
        }
        putchar('\n');
    }
    return 0;
}

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  • 第 1 页 共 1 页
作者的图片

码龙黑曜

iOS开发者/计算机科学/兽人控


华中科技大学 本科在读


Wuhan, China