Chapter 7: Problem 49

An application uses a two-dimensional array defined as follows. int days[29][5]; Write code that sums each row in the array and displays the results. Write code that sums each column in the array and displays the results.

Short Answer

Expert verified

Answer: We can use nested loops to find the sum of elements for each row and column. To sum the elements for each row, we can use an outer loop to iterate through the rows and an inner loop to iterate through the columns, summing the elements of each row. To sum the elements for each column, we can use an outer loop to iterate through the columns and an inner loop to iterate through the rows, summing the elements of each column. Finally, we can use the printf function to display the results.

Step by step solution

Initialize the array with random values (optional)

In order to sum the elements in the two-dimensional array, you need to set some values for them. You may skip this step if your code is going to be integrated into an application that already sets the values for the array. For the sake of demonstration, let's assume we need to fill the array with random values ranging from 1 to 10: ```c #include #include #include int main() { int days[29][5]; srand(time(0)); for (int i = 0; i < 29; i++) { for (int j = 0; j < 5; j++) { days[i][j] = rand() % 10 + 1; } } } ```

Sum elements for each row and display the results

To sum the elements of each row and display the results, we will use a nested for loop. The outer loop will iterate through the rows and the inner loop will iterate through the columns. For each row, we will keep a variable called "rowSum" which will be set to zero at the start of each row. Once we have traversed all the columns in a row, we will print the accumulated sum for that row. ```c for (int i = 0; i < 29; i++) { int rowSum = 0; for (int j = 0; j < 5; j++) { rowSum += days[i][j]; } printf("Sum of row %d: %d\n", i, rowSum); } ```

Sum elements for each column and display the results

For summing the elements of each column and displaying the results, we will use another nested pair of loops. However, in this case, we will switch the order of the loops. The outer loop will iterate through the columns and the inner loop will iterate through the rows. We will use a variable called "colSum" that will keep track of the sum of the elements in each column. ```c for (int i = 0; i < 5; i++) { int colSum = 0; for (int j = 0; j < 29; j++) { colSum += days[j][i]; } printf("Sum of column %d: %d\n", i, colSum); } ``` Now you have the complete code to sum the elements for each row and column in a two-dimensional array!

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An application uses a two-dimensional array defined as follows. int days[29][5]; Write code that sums each row in the array and displays the results. Write code that sums each column in the array and displays the results.

Short Answer

Step by step solution

Initialize the array with random values (optional)

Sum elements for each row and display the results

Sum elements for each column and display the results

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