Given Information : Three different functions are given: // declare 2-D array typedef int array_t[N][N]; // function to add values of 2-D array int sumA(array_t a) { // variable declaration int i, j; int sum = 0; // traverse through rows for (i = 0; i < N; i++) // traverse through elements for (j = 0; j < N; j++) { // sum of elements sum = sum + a[i][j]; } // return sum return sum; } // function to add values of 2-D array int sumB(array_t a) { // variable declaration int i, j; int sum = 0; // traverse through columns for (j = 0; j < N; j++) // traverse through rows for (i = 0; i < N; i++) { // sum of elements sum = sum + a[i][j]; } // return sum return sum; } // function to add values of 2-D array int sumC(array_t a) { //variable declaration int i,j; int sum=0; //traverse through columns for(j=0;j<N;j+=2) //traverse through rows for(i=0;i<N;i+=2) { //sum of elements sum+=(a[i][j]+a[i+1][j]+ a[i][j+1]+a[i+1][j+1]); } //return sum return sum; }

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Chapter 6, Problem 6.37HW

Program Plan Intro

Given Information:

Three different functions are given:

// declare 2-D array

typedef int array_t[N][N];

// function to add values of 2-D array

int sumA(array_t a) {

// variable declaration

int i, j;

int sum = 0;

// traverse through rows

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

// traverse through elements

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

// sum of elements

sum = sum + a[i][j];

}

// return sum

return sum;

}

// function to add values of 2-D array

int sumB(array_t a) {

// variable declaration

int i, j;

int sum = 0;

// traverse through columns

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

// traverse through rows

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

// sum of elements

sum = sum + a[i][j];

}

// return sum

return sum;

}

// function to add values of 2-D array

int sumC(array_t a)

{

//variable declaration

int i,j;

int sum=0;

//traverse through columns

for(j=0;j<N;j+=2)

//traverse through rows

for(i=0;i<N;i+=2)

{

//sum of elements

sum+=(a[i][j]+a[i+1][j]+ a[i][j+1]+a[i+1][j+1]);

}

//return sum

return sum;

}

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