x=magic(6) for i=1 :size(x,1) for j=1:size(x,2) if x(i,j)==5 break ; else x(i,j)=0; end end end如何遍历的,解释一下过程
时间: 2023-05-24 17:02:40 浏览: 51
这段代码使用了嵌套的for循环来遍历一个6x6的矩阵x,过程如下:
1. 首先,for循环会设置i=1,然后进入第一个循环。
2. 在第一个循环内,又会设置j=1,进入第二个循环。
3. 在第二个循环内,会判断x(i,j)是否等于5。如果等于5,就会跳出第二个循环,并继续执行第一个循环。如果不等于5,就会将x(i,j)赋值为0,并继续循环内的下一次迭代。
4. 循环会一直重复执行第三步,直到所有的i和j的取值都遍历完毕。
总的来说,这段代码的主要目的是将矩阵x中的所有5替换为0。如果在矩阵中找到了5,则会停止替换,并继续遍历其他元素。
相关问题
private final CharSequence getSmallTime() { Context context = getContext(); boolean is24 = DateFormat.is24HourFormat(context); LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale); final char MAGIC1 = '\uEF00'; final char MAGIC2 = '\uEF01'; SimpleDateFormat sdf; String format = is24 ? d.timeFormat24 : d.timeFormat12; if (!format.equals(mClockFormatString)) { /* * Search for an unquoted "a" in the format string, so we can * add dummy characters around it to let us find it again after * formatting and change its size. */ if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int a = -1; boolean quoted = false; for (int i = 0; i < format.length(); i++) { char c = format.charAt(i); if (c == ''') { quoted = !quoted; } if (!quoted && c == 'a') { a = i; break; } } if (a >= 0) { // Move a back so any whitespace before AM/PM is also in the alternate size. final int b = a; while (a > 0 && Character.isWhitespace(format.charAt(a-1))) { a--; } format = format.substring(0, a) + MAGIC1 + format.substring(a, b) + "a" + MAGIC2 + format.substring(b + 1); } } mClockFormat = sdf = new SimpleDateFormat(format); mClockFormatString = format; } else { sdf = mClockFormat; } String result = sdf.format(mCalendar.getTime()); if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int magic1 = result.indexOf(MAGIC1); int magic2 = result.indexOf(MAGIC2); if (magic1 >= 0 && magic2 > magic1) { SpannableStringBuilder formatted = new SpannableStringBuilder(result); if (AM_PM_STYLE == AM_PM_STYLE_GONE) { formatted.delete(magic1, magic2+1); } else { if (AM_PM_STYLE == AM_PM_STYLE_SMALL) { CharacterStyle style = new RelativeSizeSpan(0.7f); formatted.setSpan(style, magic1, magic2, Spannable.SPAN_EXCLUSIVE_INCLUSIVE); } formatted.delete(magic2, magic2 + 1); formatted.delete(magic1, magic1 + 1); } return formatted; } } return result; }添加秒
你的问题是如何在这段代码中添加秒?
这段代码的作用是获取当前时间并以指定格式显示出来,但没有显示秒数。要添加秒数,可以修改格式字符串。在这里,我们可以在格式字符串的末尾添加一个”:ss“,表示显示秒数。修改后的代码如下:
```
private final CharSequence getSmallTime() {
Context context = getContext();
boolean is24 = DateFormat.is24HourFormat(context);
LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale);
final char MAGIC1 = '\uEF00';
final char MAGIC2 = '\uEF01';
SimpleDateFormat sdf;
String format = is24 ? d.timeFormat24 : d.timeFormat12;
// Add seconds to the format string
format += ":ss";
if (!format.equals(mClockFormatString)) {
/*
* Search for an unquoted "a" in the format string, so we can
* add dummy characters around it to let us find it again after
* formatting and change its size.
*/
if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) {
int a = -1;
boolean quoted = false;
for (int i = 0; i < format.length(); i++) {
char c = format.charAt(i);
if (c == '\'') {
quoted = !quoted;
}
if (!quoted && c == 'a') {
a = i;
break;
}
}
if (a >= 0) {
// Move a back so any whitespace before AM/PM is also in the alternate size.
final int b = a;
while (a > 0 && Character.isWhitespace(format.charAt(a-1))) {
a--;
}
format = format.substring(0, a) + MAGIC1 + format.substring(a, b) + "a" + MAGIC2 + format.substring(b + 1);
}
}
mClockFormat = sdf = new SimpleDateFormat(format);
mClockFormatString = format;
} else {
sdf = mClockFormat;
}
String result = sdf.format(mCalendar.getTime());
if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) {
int magic1 = result.indexOf(MAGIC1);
int magic2 = result.indexOf(MAGIC2);
if (magic1 >= 0 && magic2 > magic1) {
SpannableStringBuilder formatted = new SpannableStringBuilder(result);
if (AM_PM_STYLE == AM_PM_STYLE_GONE) {
formatted.delete(magic1, magic2+1);
} else {
if (AM_PM_STYLE == AM_PM_STYLE_SMALL) {
CharacterStyle style = new RelativeSizeSpan(0.7f);
formatted.setSpan(style, magic1, magic2, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
}
formatted.delete(magic2, magic2 + 1);
formatted.delete(magic1, magic1 + 1);
}
return formatted;
}
}
return result;
}
```
在修改后的代码中,我们在格式字符串的末尾添加了一个冒号和“ss”,表示显示秒数。然后,我们将修改后的格式字符串传递给SimpleDateFormat对象,以便格式化当前时间。最后,我们返回格式化后的时间字符串,它包含了秒数。
用C语言写输出1到10阶幻方
幻方是指一个正方形矩阵中,每行、每列和对角线上的元素之和都相等的矩阵,而阶数则指矩阵的边长。以下是用 C 语言实现输出 1 到 10 阶幻方的代码:
```c
#include <stdio.h>
#include <stdlib.h>
#define MAX_SIZE 10
void magic_square(int n);
int main() {
int n;
printf("请输入幻方的阶数(1~10):");
scanf("%d", &n);
if (n < 1 || n > MAX_SIZE) {
printf("阶数超出范围!\n");
exit(EXIT_FAILURE);
}
magic_square(n);
return 0;
}
void magic_square(int n) {
int magic[MAX_SIZE][MAX_SIZE] = {0};
int row, col, num;
row = 0;
col = n / 2;
magic[row][col] = 1;
for (num = 2; num <= n * n; num++) {
if (num % n == 1) {
row++;
} else {
row--;
col++;
}
if (row < 0) {
row = n - 1;
}
if (col == n) {
col = 0;
}
magic[row][col] = num;
}
printf("%d 阶幻方:\n", n);
for (row = 0; row < n; row++) {
for (col = 0; col < n; col++) {
printf("%2d ", magic[row][col]);
}
printf("\n");
}
}
```
在这个程序中,我们首先要求用户输入想要生成的幻方的阶数,然后判断输入是否合法。接着,我们通过一个双重循环来逐个输出幻方中的数字。具体实现方式是,我们首先将数字 1 放在第一行中间,然后从数字 2 开始,逐个放在当前位置的右上方。如果当前位置已经在第一行,那么我们就将数字放在下一列的最后一行;如果当前位置已经在最后一列,那么我们就将数字放在下一行的第一列。最后,我们将生成的幻方输出到控制台即可。