Find the sum of row elements & column elements of a matrix

Find the sum of row elements & column elements of a matrix


Input:

1      2     3     4     5
6      7     8     9    10
11   12   13   14   15
16   17   18   19   20
21   22   23   24   25

Output:

row[0]=15
row[1]=40
row[2]=65
row[3]=90
row[4]=115

column[0]=55
column[1]=60
column[2]=65
column[3]=70
column[4]=75

Implementation:

#include <stdio.h> #include <stdlib.h> #define r 5 //change the row size here #define c 5 //change the column size here /* function to calculate the sum of elements in the row */ int getrowsum(int *a[],int i) { int sum=0,j; for(j=0;j<c;j++) { sum += *(*(a+i)+j); } return sum; } /* function to calculate the sum of the elements in the column */ int getcolumnsum(int *a[],int j) { int sum=0,i; for(i=0;i<r;i++) { sum += *(*(a+i)+j); } return sum; } int main(void) { /* storing addresses of 1-D arrays in a array of pointers */ int *a[r]; int i,j; /* allocate memory for 'r' 1-D arrays & store the starting address of those 1-D blocks in array of pointers a[] */ for(i=0;i<r;i++) *(a+i)=(int*)malloc(sizeof(int)*1000000); /* get the input 2-D array from the user */ for(i=0;i<r;i++) { for(j=0;j<c;j++) { scanf("%d",(*(a+i)+j)); // It is same as that of &a[i][j] } } /* print the sum of the elements in the row by calling getrowsum() function for every row */ for(i=0;i<r;i++) { printf("row[%d]=%d\n",i,getrowsum(a,i)); } printf("\n"); /* print the sum of the elements in the column by calling getcolumnsum() function for every column */ for(j=0;j<c;j++) { printf("column[%d]=%d\n",j,getcolumnsum(a,j)); } return 0; }