Question

Suppose that sales is a two-dimensional array of 10 rows and 7 columns wherein each component is of the type int , and sum and j are int variables. Which of the following correctly finds the sum of the elements of the fifth row of sales?1. sum = 0;for(j = 0; j < 10; j++)sum = sum + sales[5][j];2. sum = 0;for(j = 0; j < 7; j++)sum = sum + sales[4][j];3. sum = 0;for(j = 0; j < 10; j++)sum = sum + sales[4][j];4. sum = 0;for(j = 0; j < 7; j++)sum = sum + sales[5][j];

Answer 1

According to the given question, sales is a two-dimensional array and contains 10 rows and 7 columns wherein each component is of type integer and the variables sum and j are also of integer type.

Explanation:

In order to find the sum of the elements of the fifth row of sales, the correct piece of code should be:

sum=0;

for(j=0;j<7;j++)

sum=sum+sales[4][j];  

The indexing in an array always starts from zero, therefore, to calculate the sum of the fifth row, the user has to write 4 in the index to point to the fifth row.