5432154321 void count_down (int count) { for(i=count; i>1; i--) printf(" %d\t", count); } printf("A%d\n", count); if(count>1) count_down(count-1); printf("B%d\n",

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Presentation transcript:

void count_down (int count) { for(i=count; i>1; i--) printf(" %d\t", count); } printf("A%d\n", count); if(count>1) count_down(count-1); printf("B%d\n", count); main (){ count_down(5); } A5 A4 A3 A2 A1 Recursion 遞歸 1 Recursion A5 count_down(4); B5 A4 count_down(3); B4 A3 count_down(2); B3 A2 count_down(1); B2 B1 B2 B3 B4 B5 A1 B1

countDown(4) countDown(3) printf("A%i", count); printf("B%i", count); countDown(2) printf("A%i", count); printf("B%i", count); countDown(1) printf("A%i", count); printf("B%i", count); A4 A3 A2 printf("A%i", count); printf("B%i", count); countDown(?) A1 B1 B2 B3 B4 2 Recursion A4 A3 A2 A1 B1 B2 B3 B4

void count_down (int count) { } printf("A%d\n", count); if(count>1) count_down(count-1); printf("B%d\n", count); main (){ count_down(4); } Recursion 遞歸 3 Recursion A4 B A3 B3 A2 B2 A1 B1