Write a C Program to find the Sum of each row in a Matrix. Or How to write a C program to find Sum of rows in a Multi-Dimensional Array with example.
C Program to find sum of each row in a Matrix Example 1
This program allows you to enter the total number of rows and columns in a Matrix. Next, we are going to calculate the sum of matrix rows using For Loop.
/* C Program to find Sum of rows in a Matrix */
#include<stdio.h>
int main()
{
int i, j, rows, columns, a[10][10], Sum;
printf("Please Enter Number of rows and columns : ");
scanf("%d %d", &i, &j);
printf("Please Enter the Matrix Row and Column Elements \n");
for(rows = 0; rows < i; rows++)
{
for(columns = 0; columns < j; columns++)
{
scanf("%d", &a[rows][columns]);
}
}
for(rows = 0; rows < i; rows++)
{
Sum = 0;
for(columns = 0; columns < j; columns++)
{
Sum = Sum + a[rows][columns];
}
printf("The Sum of Elements of a Rows in a Matrix = %d \n", Sum );
}
return 0;
}
In this C Program to find sum of each row in a Matrix, we declared a Two-dimensional array of the size of 10 * 10. Next, printf statement ask user to enter the Matrix size (rows & columns. For instance 3 Rows, 3 Columns = a[3][3] )
Next, we used for loop to iterate each cell present in a[3][3] Matrix. scanf statement inside the for loop will store the user entered values in every individual array element such as a[0][0], a[0][1], …..
In this C Program to find sum of each row in a Matrix demo, User inserted values are: a[3][3] = {{10, 20, 30}, { 12, 22, 32}, {44, 55, 121}}
Row First Iteration: for(rows = 0; rows < 3; 0++)
The condition (0 < 3) is True.
Sum = 0
Column First Iteration: for(columns = 0; 0 < 3; 0++)
The condition (0 < 3) is True. So, it will start executing the statements inside the loop
Sum = Sum + a[rows][columns]
Sum = Sum + a[0][0] => 0 + 10 = 10
Column Second Iteration: for(columns = 1; 1 < 3; 1++) – Condition True
Sum = Sum + a[0][1] => 10 + 20 = 30
Column Third Iteration: for(columns = 2; 2 < 3; 2++) – Condition True
Sum = Sum + a[0][2] => 30 + 30 = 60
Next, the column’s value will increment to 4. Condition (columns < 3) will fail. So it will exit from the loop.
Next, we used the C Programming Printf statement to print the Sum. After this, rows value incremented to 1, and Sum will become 0.
Repeat the above steps for rows = 1 and rows = 2
Find sum of each row in a Matrix Example 2
This C program is the same as the above, but this time we separated the code using functions.
/* C Program to find Sum of rows in a Matrix */
#include<stdio.h>
void addRows(int arr[10][10], int i, int j)
{
int rows, columns;
for(rows = 0; rows < i; rows++)
{
int Sum = 0;
for(columns = 0; columns < j; columns++)
{
Sum = Sum + arr[rows][columns];
}
printf("The Sum of Elements of a Rows in a Matrix = %d \n", Sum );
}
}
int main()
{
int i, j, rows, columns, a[10][10];
printf("Please Enter Number of rows and columns : ");
scanf("%d %d", &i, &j);
printf("Please Enter the Matrix Row and Column Elements \n");
for(rows = 0; rows < i; rows++)
{
for(columns = 0; columns < j; columns++)
{
scanf("%d", &a[rows][columns]);
}
}
addRows(a, i, j);
return 0;
}
Please Enter Number of rows and columns : 3 3
Please Enter the Matrix Row and Column Elements
10 20 30
40 50 760
70 80 90
The Sum of Elements of a Rows in a Matrix = 60
The Sum of Elements of a Rows in a Matrix = 850
The Sum of Elements of a Rows in a Matrix = 240