此代碼給出分段錯誤。由GDB調試它給這個錯誤:動態數組中掃描值的分段錯誤(int ** arr)
"Program received signal SIGSEGV, Segmentation fault. 0x00007ffff7a6dde5 in _IO_vfscanf_internal (s=, format=, [email protected]=0x7fffffffdba8, [email protected]=0x0) at vfscanf.c:1902 1902 vfscanf.c: No such file or directory. "
void readData()
{
int **arr,m;
scanf("%d",&m);
arr = (int **)malloc(sizeof(int)*m);
for(int i=0;i<m;i++)
{
arr[i] = (int *)malloc(sizeof(int) * 2);
}
for(int i=0;i<m;i++)
{
printf("..%d ..\n",i); // if m = 20 then running only 12 times
scanf("%d %d",&arr[i][0],&arr[i][1]);
}
}
int main()
{
readData();
}
若m = 20然後,第二循環只運行12次,然後給予段故障。第一個循環運行20次。 請幫幫我。
'INT(* ARR)[2] = malloc的(M *的sizeof * ARR);'...然後*整個陣列*被分配爲一體,而不是作爲'm + 1'調用'malloc' :) – Sebivor