Construindo uma matriz

# include <stdio.h>
int main()
{
int t, i, M[3][4];
for (t=0; t<3; ++t)
for (i=0; i<4; ++i)
M[t][i] = (t*4)+i+1;
for (t=0; t<3; ++t)
{
for (i=0; i<4; ++i)
printf ("%3d ", M[t][i]);
printf ("\n");
}
return(0);
}