阵列(3)
19.5 用保留值标记阵列长度
保留值(这个值可以设定):0,-1,
1 #include <stdio.h> 2 int maxv(int[]); 3 4 int main() { 5 int a[4] = {1, 3, 4, -1}; // 这里的-1表示保留值 6 printf("Max: %d\n", maxv(a)); 7 int b[6] = {6, 9, 7, 8, 3, -1}; 8 printf("Max: %d\n", maxv(b)); 9 return 0; 10 } 11 12 int maxv(int v[]) { 13 int max = v[0], i = 1; 14 while (v[i] != -1) { 15 if (v[i] > max) { 16 max = v[i]; 17 } 18 i++; 19 } 20 return max; 21 } 22 23 Max: 4 24 Max: 9 25 26 Process returned 0 (0x0) execution time : 12.892 s 27 Press any key to continue.
1 #include <stdio.h> 2 int length(int[]); 3 4 int main() { 5 int v[] = {1, 2, 3, -1}; 6 printf("%d\n", length(v)); 7 return 0; 8 } 9 10 int length(int v[]) { 11 int i = 0; 12 while (v[i] != -1) { 13 i++; 14 } 15 return i; // 此时的i表示的是资料型别多少个,而数组长度为 i+1 16 } 17 18 3 19 20 Process returned 0 (0x0) execution time : 4.187 s 21 Press any key to continue.