(1) can be initialized by direct assignment at definition time.
(2) Once defined, you can assign values to its elements one by one.
Two examples
# include & ltstdio.h & gt
Invalid? Display (int? arr[2][3]，？ int？ Row,? int？ col){
For what? (int？ Me? =? 0; ? Me? & lt？ Row; ? i++){
For what? (int？ j？ =? 0; ? j？ & lt？ col？ j++){
printf("%d？" ,? arr[I][j])；
}
puts(" ")；
}
puts(" ")；
}
int？ main(){
//method (1)
int？ arr 1[2][3]？ =? {? {? 1,? 2,? 3? },? {? 4,? 5,? 6? }? };
//Method (2)
int？ arr 2[2][3]；
int？ num？ =? 1;
For what? (int？ Me? =? 0; ? Me? & lt？ 2; ? i++){
For what? (int？ j？ =? 0; ? j？ & lt？ 3; ? j++){
arr2[i][j]？ =? num++；
}
}
Display (arr 1,? 2,? 3);
Display (arr2, 2,? 3);
getchar()；
Return? 0;
}3 running results
It can be seen from the results that the two methods have achieved the same effect.
4 expansion
Because the addresses of elements in the array in C language are continuous, the following writing method is also possible, and the running effect is the same as above.
# include & ltstdio.h & gt
Invalid? Display (int? arr[2][3]，？ int？ Row,? int？ col){
For what? (int？ Me? =? 0; ? Me? & lt？ Row * column; ? i++){
For what? (int？ j？ =? 0; ? j？ & lt？ col？ j++){
printf("%d？" ,? arr[I][j])；
}
puts(" ")；
}
puts(" ")；
}
int？ main(){
//method (1)
int？ arr 1[2][3]？ =? {? 1,? 2,? 3,? 4,? 5,? 6? };
//Method (2)
int？ arr 2[2][3]；
int？ num？ =? 1;
int？ *p？ =? * arr2// points to the first element of the array.
For what? (int？ Me? =? 0; ? Me? & lt？ 2? *? 3; ? i++){
*p++？ =? num++；
}
Display (arr 1,? 2,? 3);
Display (arr2, 2,? 3);
getchar()；
Return? 0;
}