1. c++
Write the implementations of two functions to carry out task on a two dimensional array.
The first function with prototype
void colsums(int a[r][c], int csum[], size_t rnum, size_t cnum );
should take as parameters a two-dimensional array a[][] of ints with rnum rows and cnum columns,
compute the sums along the columns and store the sums in the array csum.