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 int arr [m] [n]. 

 # include & lt; Stdio. H> 
Int main () 
{
Int m, n; 
Printf (" need to enter m rows value: "); 
The scanf (" % d ", & amp; M); 
Printf (" need to input n column value: "); 
The scanf (" % d ", & amp; N); 

//int arr [m] [n]. 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - the following code for the dynamic allocation, pointer to a pointer, can be regarded as a two-dimensional array -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
Int arr=new int * * * [m]. 
Int I, j; 
For (I=0; i {
Arr [I]=new int [n]. 
} 
//loop input; 
For (I=0; i{
For (j=0; J{
Printf (" please enter the first line % d % d column value: ", I + 1, j + 1); 
The scanf (" % d ", & amp; Arr [I] [j]); 
} 
} 
//loop output; 
For (I=0; i{
For (j=0; J{
Printf (" % d \ t ", arr [I] [j]); 
} 
printf("\n"); 
} 

Int b [100]; 
For (I=0; i{
For (j=0; J{
Printf (" % d \ t ", arr [j] [I]);//add \ t -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
} 
printf("\n");//-- -- -- -- -- -- -- -- -- -- -- -- -- add a line break -- -- -- -- -- -- -- -- -- -- -- 
} 
//-- -- -- -- -- -- -- -- -- -- -- - the following code for the release of the dynamically allocated space -- -- -- -- -- -- -- -- -- -- -- -- -- 
The delete [] * arr; 
The delete [] arr; 
return 0; 
} 

CodePudding user response:

 for (I=0; i {
The delete [] arr [I]; 
} 
The delete [] arr; 

CodePudding user response:

 
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
Description: dynamic application of two-dimensional array 
Author: wowpH 
Csdnid: pfdvnah 
Date: 2019-11-9 15:38:25 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
# include & lt; Stdio. H> 
#include  
Int main (void) {
Int the row, col. 
Printf (" input rows and columns: "); 
Scanf_s (" % d % d ", & amp; The row, & amp; Col); 

Int * * matrix=NULL;//initialized to NULL 

//remove C6085 and C6086 warning 
If (row & lt;=0 | | col & lt;=0) {
Printf (" the number of rows or columns illegal! \n"); 
exit(-1); 
} 

//dynamic application memory 
Matrix=(int) * * malloc (row * sizeof (int *)); 

//remove C6011 warning 
If (NULL==matrix) {
Printf (" can't dynamic application memory! \n"); 
exit(-1); 
} 

for (int i=0; i Matrix [I]=(int *) malloc (col * sizeof (int)); 

//remove C6011 warning 
If (NULL==matrix [I]) {
Printf (" can't dynamic application memory! \n"); 
exit(-1); 
} 
} 

//to two-dimensional array assignment 
for (int i=0; i For (int j=0; J & lt; Col. + + j) {
Matrix [I] [j]=I * col + j; 
} 
} 

//output two-dimensional array 
for (int i=0; i For (int j=0; J & lt; Col. + + j) {
Printf (" % 2 d ", matrix [I] [j]); 
Putchar ((j & lt; Col - 1)? "' : '\ n'); 
} 
} 

//release the memory 
for (int i=0; i Free (matrix [I]); 
} 
Free (matrix); 
return 0; 
} 

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