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ÌâÄ¿£ºÁ½¸öƹÅÒÇò¶Ó½øÐбÈÈü£¬¸÷³öÈýÈË¡£¼×¶ÓΪa,b,cÈýÈË£¬ÒÒ¶ÓΪx,y,zÈýÈË¡£ÒѳéÇ©¾ö¶¨±ÈÈüÃûµ¥¡£ÓÐÈËÏò¶ÓÔ±´òÌý±ÈÈüµÄÃûµ¥¡£a˵Ëû²»ºÍx±È£¬c˵Ëû²»ºÍx,z±È£¬Çë±à³ÌÐòÕÒ³öÈý¶ÓÈüÊÖµÄÃûµ¥¡£ public class lianxi18 {

static char[] m = { 'a', 'b', 'c' }; static char[] n = { 'x', 'y', 'z' }; public static void main(String[] args) { for (int i = 0; i < m.length; i++) { for (int j = 0; j < n.length; j++) { if (m[i] == 'a' && n[j] == 'x') { continue;

} else if (m[i] == 'a' && n[j] == 'y') { continue;

} else if ((m[i] == 'c' && n[j] == 'x') || (m[i] == 'c' && n[j] == 'z')) { continue;

} else if ((m[i] == 'b' && n[j] == 'z') || (m[i] == 'b' && n[j] == 'y')) {

continue; } else } } } }

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ÌâÄ¿£º´òÓ¡³öÈçÏÂͼ°¸£¨ÁâÐΣ© * *** ***** ******* ***** *** *

public class lianxi19 {

public static void main(String[] args) {

int H = 7, W = 7;//¸ßºÍ¿í±ØÐëÊÇÏàµÈµÄÆæÊý for(int i=0; i<(H+1) / 2; i++) { for(int j=0; j

}

for(int k=1; k<(i+1)*2; k++) {

}

}

for(int i=1; i<=H/2; i++) { for(int j=1; j<=i; j++) {

}

for(int k=1; k<=W-2*i; k++) {

}

} } }

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public class lianxi20 {

public static void main(String[] args) { int x = 2, y = 1, t;

double sum = 0;

for(int i=1; i<=20; i++) { sum = sum + (double)x / y; t = y; y = x; x = y + t; } } }

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ÌâÄ¿£ºÇó1+2!+3!+...+20!µÄºÍ public class lianxi21 {

public static void main(String[] args) { long sum = 0; long fac = 1;

for(int i=1; i<=20; i++) { fac = fac * i; sum += fac; } }

}

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ÌâÄ¿£ºÀûÓõݹ鷽·¨Çó5!¡£ public class lianxi22 {

public static void main(String[] args) { int n = 5; rec fr = new rec(); } }

class rec{

public long rec(int n) { long value = 0 ; if(n ==1 ) { value = 1; } else {

value = n * rec(n-1); }

return value; } }

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