尽管存在memset,但"使用未初始化的值"

我分配了一个2d数组并使用memset用零填充它.

#include
#include
#include

void main() {
    int m=10;
    int n =10;
    int **array_2d;
    array_2d = (int**) malloc(m*sizeof(int*));
    if(array_2d==NULL) {
        printf("\n Could not malloc 2d array \n");
        exit(1);
    }
    for(int i=0;i

之后我使用valgrind [1]来检查内存错误.我得到以下错误:Conditional jump or move depends on uninitialised value(s)第24行(printf("%i ", array_2d[i][j]);).我一直认为memset是初始化数组的函数.我怎样才能摆脱这个错误？

谢谢!

Valgrind输出:

==3485== Memcheck, a memory error detector
==3485== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==3485== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright info
==3485== Command: ./a.out
==3485== 
(0,0)=0 (0,1)===3485== Use of uninitialised value of size 4
==3485==    at 0x409E186: _itoa_word (_itoa.c:195)
==3485==    by 0x40A1AD1: vfprintf (vfprintf.c:1613)
==3485==    by 0x40A8FFF: printf (printf.c:35)
==3485==    by 0x8048724: main (playing_with_valgrind.c:39)
==3485== 
==3485== 
==3485== ---- Attach to debugger ? --- [Return/N/n/Y/y/C/c] ---- 
==3485== Conditional jump or move depends on uninitialised value(s)
==3485==    at 0x409E18E: _itoa_word (_itoa.c:195)
==3485==    by 0x40A1AD1: vfprintf (vfprintf.c:1613)
==3485==    by 0x40A8FFF: printf (printf.c:35)
==3485==    by 0x8048724: main (playing_with_valgrind.c:39)


[1] valgrind --tool=memcheck --leak-check=yes --show-reachable=yes --num-callers=20 --track-fds=yes --db-attach=yes ./a.out

[GCC-CMD] gcc -std=c99 -lm -Wall -g3 playing_with_valgrind.c


1> AraK..：
在这一行:

/* sizeof(n*sizeof(int)) retuns a value of type size_t.
   This means you are initializing only sizeof(size_t) of the array. */
memset(((array_2d)[i]),0,sizeof(n*sizeof(int)));


它应该是:

memset(((array_2d)[i]),0, n*sizeof(int));