Matrix Unit Digit Swap

The program must accept an integer matrix of size R*C, where C is even and swap the unit digits of the elements in columns 1 and 2, then 3 and 4 and so on till columns C-1 and C. Then the program must print the revised matrix as the output.

Boundary Condition(s):
1 <= R, C  <= 100
1 <= Value of an element in the matrix <= 1000

Input Format:
The first line contains R and C separated by space(s).
The next R lines each containing C integer values separated by a space.

Output Format:
R lines each containing C integer values separated by a space.

Example Input/Output 1:
Input:
3 4
96 61 138 32
150 67 131 177
172 103 83 45

Output:
91 66 132 38
157 60 137 171
173 102 85 43

 #include<stdio.h>
 #include<stdlib.h>

 int main() {
     int row, col;
     scanf("%d%d", & row, & col);
     int matrix[row][col], i, j, s, temp, g, a;
     for (i = 0; i < row; i++) {
         for (j = 0; j < col; j++) {
             scanf("%d", & matrix[i][j]);
         }
     }
     for (i = 0; i < row; i++) {
         for (j = 0; j < col; j += 2) {
             s = matrix[i][j];
             temp = matrix[i][j + 1];
             g = s / 10;
             a = temp / 10;
             matrix[i][j] = g * 10 + temp % 10;
             matrix[i][j + 1] = a * 10 + s % 10;
             printf("%d %d ", matrix[i][j], matrix[i][j + 1]);
         }
         printf("n");
     }
 }