foo.c:3:1: warning: return type defaults to 'int' [-Wimplicit-int]
    3 | Input(int a[][N],int m,int n)
      | ^~~~~
foo.c:26:1: warning: return type defaults to 'int' [-Wimplicit-int]
   26 | Output(int a[][N],int m,int n)
      | ^~~~~~
foo.c: In function 'Input':
foo.c:8:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    8 |    scanf("%d",&a[i][j]);
      |    ^~~~~~~~~~~~~~~~~~~~
foo.c:9:1: warning: control reaches end of non-void function [-Wreturn-type]
    9 | }
      | ^
foo.c: In function 'Output':
foo.c:35:1: warning: control reaches end of non-void function [-Wreturn-type]
   35 | }
      | ^
foo.c: In function 'main':
foo.c:40:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   40 |  scanf("%d%d%d",&m,&n,&p);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~

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