C Random Fonksiyon Sorunu

#include <stdio.h> 
  #include <stdlib.h> 
  #include <time.h> 
   
  int main(int argc, char *argv[]) { 
  	 
  	int i,j,a,b; 
  	 
  	printf("Matris Satir Sayisi: "); 
  	scanf("%d",&a); 
  	printf("Matris Sutun Sayisi: "); 
  	scanf("%d",&b); 
  	 
  	int dizi[a][b]; 
  	 
  	srand(time(NULL)); 
  	 
  	for (i=0;i<a;i++){ 
  		for (j=0;j<b;j++){ 
  		//srand(time(NULL)); 
  		dizi[i][j]=(rand()%11);  	 
  		} 
  	} 
  	printf("\n---Random %dx%d Matris---\n\n",a,b); 
  	 
  	for (i=0;i<a;i++){ 
  		for (j=0;j<b;j++){ 
  		printf("%3.1d ",dizi[i][j]);   
  		if (j==b-1) 
  		printf("\n\n");	 
  		} 
  	} 
  		 
  	return 0; 
  }

 
   
      srand (42); 
      for (int i=0; i < 10; i++) printf ( " %d " , rand() ); 
   
      printf ( "\n" ); 
   
      srand (42); 
      for (int i=0; i < 10; i++) printf ( " %d " , rand() ); 
   
      printf ( "\n" ); 
   
      system ( "PAUSE" );