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-   -   problem in returning a matrix(2d array) to main function (http://www.go4expert.com/forums/returning-matrix-2d-array-main-function-t7060/)

rohanag 26Oct2007 19:41

problem in returning a matrix(2d array) to main function
 
in my program, i've taken the input from user, passed the 2 input matrices to the addtn function which performs addition,
but the function is not returning the correct values to main,it is actually returning garbage values
Mainly, i want to learn how to return a 2d array to the main module

This is main module
Code: C

#include<stdio.h>
#include<conio.h>
void input(int (*in)[3]);
int *addtn(int (*x)[3],int (*y)[3]);
void main()
{
int mat1[3][3],mat2[3][3],choice;
int i,j,(*res)[3];
clrscr();

printf("\nEnter the elements of first matrix:\n");
input(mat1);
printf("\nEnter the elements of second matrix:\n");
input(mat2);

do
    {
    clrscr();
    printf("\t\t\t 1) ADDITION\n");
    printf("\t\t\t 2) EXIT\n\n\n");
    printf("\n\nEnter Your choice: ");
    scanf("%d",&choice);
        switch(choice)
        {
        case 1:
            res=addtn(mat1,mat2);
            for(i=0;i<3;i++)
            {
                for(j=0;j<3;j++)
                {
                printf("%d\t",*(*(res+i)+j));
                }
            }
            getch();
            break;
        case 2:
            exit(1);
        default :
            printf("Not in the list of choices. Enter from the list only!");
        }

}while(1);
}


This is for input
Code: C

//********************************INPUT**************************
void input(int (*in)[3])
{
int i,j;
for(i=0;i<3;i++)
{
    for(j=0;j<3;j++)
    {
        printf("\nEnter the Element of row,%d and col,%d: ",i+1,j+1);
        scanf("%d",(*(in+i)+j));
    }
}
getch();
clrscr();
}


For addition, the problem area, which is not returning correctly
Code: C

int *addtn(int (*x)[3],int (*y)[3])
{
int i,j,c[3][3];
for(i=0;i<3;i++)
    for(j=0;j<3;j++)
        c[i][j]=0;


for(i=0;i<3;i++)
{
    for(j=0;j<3;j++)
    {
        c[i][j]= *(*(x+i)+j)+ *(*(y+i)+j);    //performing addition here
    }
}
getch();
clrscr();
return(c);             //returning here
}


dharmaraj.guru 29Oct2007 11:40

Re: problem in returning a matrix(2d array) to main function
 
Can you please give me the warning/error message if you get?
If no such, have you tried to print that array?


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