C Exercises: Develop a small part of spreadsheet software

Last update on September 19 2025 12:44:59 (UTC/GMT +8 hours)

Add rows and columns of a matrix

Your task is to develop a small part of spreadsheet software.

Write a C program, which adds up columns and rows of given table as shown in the following figure.

Input:
n (the size of row and column of the given table)
1st row of the table
2nd row of the table
:
:
n th row of the table
The input ends with a line consisting of a single 0.
Output:
For each dataset, print the table with sum of rows and columns.

Sample Solution:

C Code:

#include <stdio.h>

int main() {
  // Declare a 2D array to store cell data
  int cell_data[11][11];
  int i, j, n, sum_val;

  // Prompt user for input
  printf("Input number of rows/columns:\n"); 
  scanf("%d", &n);

  // Prompt user for cell values
  printf("Input the cell value\n"); 

  // Check if n is a positive value
  if (n > 0) {
    // Loop through rows
    for(i = 0; i < n; i++) {
      printf("\nRow %d input cell values\n", i);

      // Loop through columns
      for(j = 0; j < n; j++) {
        // Read cell value and store it in the array
        scanf("%d", &cell_data[i][j]);
      }
    }

    // Calculate row sums and update array
    printf("\nResult:\n");
    for(i = 0; i < n; i++) {
      sum_val = 0;
      for(j = 0; j < n; j++) {
        sum_val += cell_data[j][i];
      }
      cell_data[n][i] = sum_val;
    }

    // Calculate column sums and update array
    for(i = 0; i < n; i++) {
      sum_val = 0;
      for(j = 0; j < n; j++) {
        sum_val += cell_data[i][j];
      }
      cell_data[i][n] = sum_val;
    }

    // Calculate total sum and update array
    sum_val = 0;
    for(i = 0; i < n; i++) {
      sum_val += cell_data[n][i];
    }
    cell_data[n][n] = sum_val;

    // Print the updated array
    for(i = 0; i < n + 1; i++) {
      for(j = 0; j < n + 1; j++) {
        printf("%5d", cell_data[i][j]);
      }
      printf("\n");
    }
  }

  // Return 0 to indicate successful execution
  return 0;
}

Sample Output:

Input number of rows/columns:
4
Input the cell value

Row 0 input cell values
25
69
51
26

Row 1 input cell values
68
35
29
54

Row 2 input cell values
54
57
45
63

Row 3 input cell values
61
68
47
59

Result:
   25   69   51   26  171
   68   35   29   54  186
   54   57   45   63  219
   61   68   47   59  235
  208  229  172  202  811

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to read an n×n matrix and compute the sum of each row and column, displaying the totals.
• Write a C program to dynamically allocate a matrix, calculate row and column sums, and print the augmented matrix.
• Write a C program to use nested loops to add row-wise and column-wise totals to a matrix and display the final table.
• Write a C program to implement functions that compute row sums and column sums of a given matrix and print them formatted.

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