A program function to find the sum of the rows and columns in a 2d array

Question

I've got the program body, most of my errors are in my function. I've tried fixing it but i can't change the data types.

#include <stdio.h>

int sumrow (int matrix);
int sumcol (int matrix);

int main () {

int matrix [3][4] = { {5, 7, 4, 8}, {6, 8, 2, 4}, {2, 7, 9, 6} };
int sum;

sumrow = matrix[3][4];

[Error] assignment of function 'int sumrow(int)' This data type error makes no sense to me and I can't change it. [Error] cannot convert 'int' to 'int(int)' in assignment

sumcol = matrix[3][4];

[Error] assignment of function 'int sumcol(int)' [Error] cannot convert 'int' to 'int(int)' in assignment The errors here are identical and I am probably calling the error incorrectly.

return 0;
}


int sumrow (int matrix){
int i, j, sum = 0;

for (i = 0; i < 4; ++i) 
    {
        for (j = 0; j < 3; ++j) 
        {
            sum = sum + matrix[i][j] ;

[Error] invalid types 'int[int]' for array subscript Both functions have the same error and I think it's because of the variables i used.

        }
    }
return printf("Sum of the %d row is = %d\n", sum);
}


int sumcol (int matrix){

int i, j, sum = 0;
    for (j = 0; j < 3; ++j) 
    {
        for (i = 0; i < 4; ++i)
        {
            sum = sum + matrix[i][j];

[Error] invalid types 'int[int]' for array subscript I don't know how to fix this error.

        }
    }
return printf("Sum of the %d column is = %d\n", sum);
 }

int sumcol (int matrix); and sumcol = matrix[3][4];: Is sumcol supposed to be a function or an int? Same question with int sumrow (int matrix);. — Fiddling Bits
– Fiddling Bits, Commented Jun 19, 2020 at 13:45
You accessing memory outside the array here: sumrow = matrix[3][4]; and sumcol = matrix[3][4];. — Fiddling Bits
– Fiddling Bits, Commented Jun 19, 2020 at 13:47
int sumrow (int matrix) should be int sumrow (int matrix[3][4]) and the call should be sumrow(matrix) — stark
– stark, Commented Jun 19, 2020 at 14:48

stark · Accepted Answer · 2020-06-19 16:07:23Z

1

The subroutine should be defined to take a 2D array instead of a single int. Note that you can leave the leftmost dimension empty.

int sumrow (int matrix[][4]){
    int i, j, sum = 0;  
    for (i = 0; i < 4; ++i)
    etc...

And you need to call it by passing the array, not one element:

int sum = sumrow(matrix);

The return value of sumrow should be the sum that you calculated:

return sum;

edited Jun 19, 2020 at 16:07

answered Jun 19, 2020 at 15:24

stark

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