Creating matrices using for-loops in C -

i'm trying create 2 matrices using loops in c.

matrix [18x16], each element a[i,j] = + j, (i=1,...,18; j=1,...,16)
matrix b [16x18], each element b[i,j] = + 2j, (i=1,...,16; j=1,...,18)

according ubuntu (virtual machine) terminal output, i'm missing entire row matrix a, , both matrix , b have incorrect elements @ 2 specific places: a[17,16] , b[15,18], respectfully (please see picture below).

code follows, , appreciated.

#include <stdio.h>  int a[18][16]; int b[16][18]; int i, j;   int main(void) {     // create matrix     for(i = 1; < 18; i++){          for(j = 1; j < 16; j++){             a[i][j] = + j;             printf("%d ", a[i][j]);         } // end inner loop          printf("\n");     } // end outer loop      printf("\n");      // create b matrix     for(i = 1; < 16; i++){          for(j = 1; j < 18; j++){             b[i][j] = + (2*j);             printf("%d ", b[i][j]);         } // end inner loop          printf("\n");     } // end outer loop } 

terminal output:

as holsetly pointed out, c 0-based.

so need make following changes.

for(i = 0; < 18; i++){     for(j = 0; j < 16; j++){         a[i][j] = + j + 2;    // add 1 i, 1 j         printf("%d ", a[i][j]);     } // end inner loop     printf("\n"); } // end outer loop 

similarly, make changes other loop.

edit: second loop, need add 3, i + 2j proper answer.