Row sums. Write code for the function printRowSums.

Question

Write code for the function printRowSums. It should print the sum of each row of the matrix (put a single space after each sum).

For the matrix shown here:

1 2 3 4 5

6 7 8 9 10

You should print "15 40 "

Hints:

1. Going to want nested loops...

Code:

#include <iostream>

#include <climits>

using namespace std;

const int NUM_COLS = 5;

void printRowSums(const int values[][NUM_COLS], int numRows) {

//Do not modify anything on or above the line below this

//YOUR_CODE_BELOW

//YOUR_CODE

//YOUR_CODE_ABOVE

//Do not modify anything on or below the line above this

}

int main()

{

int nums[2][NUM_COLS] = {{1, 2, 3, 4, 5},

{11, 2, 3, 4, 5}};

int nums2[5][NUM_COLS] = {{21, 2, 3, 4, 5},

{21, 2, 3, 4, 5},

{1, 12, 3, 4, 5},

{2, 2, 23, 4, 5},

{1, 2, 3, 24, 5}};

printRowSums(nums, 2);

cout << endl;

printRowSums(nums2, 5);

cout << endl;

return 0;

}

Tried code:

#include <iostream>

#include <climits>

using namespace std;

const int NUM_COLS = 5;

void printRowSums(const int values[][NUM_COLS], int numRows) {

//Do not modify anything on or above the line below this

//YOUR_CODE_BELOW

//YOUR_CODE

long rowTotal=0;

int i,j;

for (i=0; i<numRows; i++)

{

rowTotal = 0;

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

{

rowTotal += values[i][j];

}

cout << (i+1) << rowTotal << endl;

}

//YOUR_CODE_ABOVE

//Do not modify anything on or below the line above this

}

int main()

{

int nums[2][NUM_COLS] = {{1, 2, 3, 4, 5},

{11, 2, 3, 4, 5}};

int nums2[5][NUM_COLS] = {{21, 2, 3, 4, 5},

{21, 2, 3, 4, 5},

{1, 12, 3, 4, 5},

{2, 2, 23, 4, 5},

{1, 2, 3, 24, 5}};

printRowSums(nums, 2);

cout << endl;

printRowSums(nums2, 5);

cout << endl;

return 0;

}

1. Going to want nested loops...

Results:

Input:

OutputExpected

115

225

135

235

325

436

535

Expected:

15 25

35 35 25 36 35

Answer 1

void printRowSums(const int values[][NUM_COLS], int numRows) {

//Do not modify anything on or above the line below this

//YOUR_CODE_BELOW

long rowTotal=0;

int i,j;

for (i=0; i<numRows; i++)

{

rowTotal = 0;

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

{

rowTotal += values[i][j];

}

cout << rowTotal << " "<< endl;

}

//YOUR_CODE_ABOVE

//Do not modify anything on or below the line above this