power跟pow函数有什么区别语言里面有power这个函数吗 c语言中power的意思

power\u662f\u4ec0\u4e48\u51fd\u6570\uff1f\u8c22\u8c22

\u4e0d\u77e5\u4f60\u95ee\u7684\u662f\u90a3\u79cd\u8bed\u8a00\u3002
\u5728\u82f1\u8bed\u4e2d\uff0cpower\u4e00\u8bcd\u53ef\u4ee5\u8868\u793a\u201c\u4e58\u65b9\u201d\u7684\u610f\u601d\u3002

power\u5728C\u8bed\u8a00\u4e2d\u6ca1\u6709\u7279\u522b\u7684\u542b\u4e49\uff0c\u65e2\u4e0d\u662f\u5173\u952e\u5b57\u4e5f\u4e0d\u662f\u5e93\u51fd\u6570\u7684\u51fd\u6570\u540d\u3002
\u53ef\u80fd\u662f\u7f16\u7a0b\u4eba\u5458\u81ea\u5b9a\u4e49\u7684\u4e00\u4e2a\u53d8\u91cf\u540d\u6216\u51fd\u6570\u540d\u3002

\u4e3e\u4f8b\u5982\u4e0b\uff1a
int power; // \u5b9a\u4e49\u4e00\u4e2aint\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u53d8\u91cf\u540d\u4e3apowerdouble power; // \u5b9a\u4e49\u4e00\u4e2adouble\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u53d8\u91cf\u540d\u4e3apowerint power(int a, int b) // // \u81ea\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\uff0c\u51fd\u6570\u540d\u4e3apower{ return a+b;}
C\u8bed\u8a00\u4e2d\u53ea\u6709pow\u5e93\u51fd\u6570\uff0c\u6ca1\u6709power\u5e93\u51fd\u6570\u3002
\u51fd\u6570\u539f\u578b\uff1adouble pow(double x, double y);
\u529f \u80fd\uff1a\u8ba1\u7b97x^y
\u8fd4 \u56de \u503c\uff1a\u8ba1\u7b97\u7ed3\u679c

\u5982\uff1a
double x = 2, y;y = pow(3.14, x); // \u8ba1\u7b973.14\u7684\u5e73\u65b9



1.最简单的方法:
public static String reverse1(String str)
{
return new StringBuffer(str).reverse().toString();
}
2.最常用的方法:
public static String reverse3(String s)
{
char[] array = s.toCharArray();
String reverse = ""; //注意这是空串,不是null
for (int i = array.length - 1; i >= 0; i--)
reverse += array[i];
return reverse;
}
3.常用方法的变形:
public static String reverse2(String s)
{
int length = s.length();
String reverse = ""; //注意这是空串,不是null
for (int i = 0; i < length; i++)
reverse = s.charAt(i) + reverse;//在字符串前面连接, 而非常见的后面
return reverse;
}
4.C语言中常用的方法:
public static String reverse5(String orig)
{
char[] s = orig.toCharArray();
int n = s.length - 1;
int halfLength = n / 2;
for (int i = 0; i <= halfLength; i++) {
char temp = s[i];
s[i] = s[n - i];
s[n - i] = temp;
}
return new String(s); //知道 char数组和String相互转化
}

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