# 打印數組的索引下標 ## 例子 #include <stdio.h> int num[10] = { 1 << 0, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7, 1 << 8, 1 << 9 }; int main (void) { int i; for (i = 0; i < 10; i++) printf ("num[%d] = %d\n", i, num[i]); return 0; } ## 技巧 在gdb中，當打印一個數組時，缺省是不打印索引下標的： (gdb) p num $1 = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512} 如果要打印索引下標，則可以通過如下命令進行設置： (gdb) set print array-indexes on (gdb) p num $2 = {[0] = 1, [1] = 2, [2] = 4, [3] = 8, [4] = 16, [5] = 32, [6] = 64, [7] = 128, [8] = 256, [9] = 512} 詳情參見[gdb手冊](https://sourceware.org/gdb/onlinedocs/gdb/Print-Settings.html#index-set-print) ## 貢獻者 xmj