my answer

gistfile1.c

#include<stdio.h>

int main(int argc, char** argv) {

   int n, c;
   int retVal;
   if((retVal = scanf("%d %d", &n, &c)) != 2) {
       printf("only scan in %d items\n", retVal);
       return 1;
   }


   int numWholeRows = n / c;
   int numWholeCols = n % c;
   int numTotalRows = (n / c) + ((n % c == 0) ? 0 : 1);

   printf("%d %d %d %d %d\n",n, c, numWholeRows, numWholeCols, numTotalRows);

   int i,j;
   for(i = 0; i < numTotalRows; i++) {
      for(j = 0; j < c; j++) {
         if(i >= numWholeRows && j >= numWholeCols) {
            printf("  ");
            continue;
         }
         printf("%d ", (i + 1) + j * ((j <= numWholeCols) ? numTotalRows : numWh
oleRows));
      }
      printf("\n");
   }

   return 0;
}