Thread: having an testing issue

So long story short... i am new to C and in a class right now that is challenging me in a lot of areas.

I am trying to figure out what to pass and how to test my code through the Main function. I want it to print out the numbers of my A[j][i] as i am using memory pointers but can never seem to get the code to compile... Any help would be great. (I am going to office hours today so jut trying to understand more beforehand)

Thanks,
Kuz

Code:

include <stdlib.h>
#include <stdio.h>


#define M 52


typedef int Marray_t[M][M];




void transpose(Marray_t A) 
{




    int i,j;
    
    
    for(i=0; i<M; i++)
    {
        int *Aji = (int *)A + i;
        int *Ai = (int *)A + (M * i);


        for(j=0; j<i;j++)
        {


        
        int t = *Aji +i; // to to store the pointer of 
        *(Aji + i) = *Ai; // store the value of another pointer *Ai
        *Ai = t; // then store the value of t
        *Ai = *Ai + M; // 




        }


    }


    for(i = 0; i < M; i++)
    {
        for(j = 0; j < M; j++)
            printf("%d\t", A[i][j]);
    }




}


int main() // My Main function to print out the numbers in A[j][i]
{
    int i,j;


    for(i=0; i<M; i++)
        for(j=0; j<M; j++)
        {
            printf("%d\t", A[j][i]);
            printf("\n");


            return 0;
        }


}

What are you trying to do with that typedef?

Where have you declared an array named A?

Jim

From what i understand is that A is coming from the typedef and transpose.

Code:

typedef int Marray_t[M][M];




void transpose(Marray_t A)

we then can call on the pointer from memory from M which has i guess mapped out 52.

Although i dont have it in the Main function i would think it would carry over... i could be wrong in that aspect though.

From what i understand is that A is coming from the typedef and transpose.

Then you understand wrong, a typedef creates a type not an instance of a type.

Although i dont have it in the Main function i would think it would carry over

Nope, that parameter is only used inside that one function but not in main().

Jim

Jim

got it... i figured out what you were talking about. i fixed the main to include the Marray_t A as seend in the code... it now compiles and works! Thanks for your help.

Code:

int main() // My Main function to print out the numbers in A[j][i]
{
	int i,j;






	Marray_t A;
	
	for(i=0; i<M; i++)
	{




		for(j=0; j<M; j++)
		{
			printf("%d\t", A[j][i]);
			// printf("somthing happended");


				
		}
		printf("\n");


	}
	return 0;


}