我編寫了個回文數的程序：#include <stdio.h>#include <stdlib.h>#include <string.h>int main(){int i, j;int m, n;int f = 1;char c[10];for (i=1; i<257; i++){m = i * i;itoa(m, c, 10);n = strlen(c);for (j=0; j<n/2; j++){if (c[j] != c[n-1-j]){f = 0;break;}}if (f){printf ("%d\n", i);}}return 0;}結果編譯時提示信息：/tmp/cc4rfntR.o: In function `main':jc.c:(.text+0x44): undefined reference to `itoa'collect2: ld returned 1 exit status請問這是為什么？？請高手指教，小弟不甚感激！??！一樓：為什么會沒有itoa這個函數？？？