/in/foo.c: In function 'main':
/in/foo.c:5:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d%d%d",&m,&n,&p);
  ^~~~~
/in/foo.c:5:2: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:5:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:22:12: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
            printf("%d ",c[i][j]);
            ^~~~~~
/in/foo.c:22:12: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:22:12: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:21:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for(j=0;j<p;j++)
         ^~~
/in/foo.c:23:12: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
            printf("\n");
            ^~~~~~
/in/foo.c:23:12: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:23:12: note: include '<stdio.h>' or provide a declaration of 'printf'