foo.c: In function 'distance':
foo.c:19:13: warning: format '%f' expects argument of type 'float *', but argument 2 has type 'double *' [-Wformat=]
     scanf("%f %f %f %f",&a[i][0],&a[i][1],&a[i][2],&a[i][3]);
            ~^           ~~~~~~~~
            %lf
foo.c:19:16: warning: format '%f' expects argument of type 'float *', but argument 3 has type 'double *' [-Wformat=]
     scanf("%f %f %f %f",&a[i][0],&a[i][1],&a[i][2],&a[i][3]);
               ~^                 ~~~~~~~~
               %lf
foo.c:19:19: warning: format '%f' expects argument of type 'float *', but argument 4 has type 'double *' [-Wformat=]
     scanf("%f %f %f %f",&a[i][0],&a[i][1],&a[i][2],&a[i][3]);
                  ~^                       ~~~~~~~~
                  %lf
foo.c:19:22: warning: format '%f' expects argument of type 'float *', but argument 5 has type 'double *' [-Wformat=]
     scanf("%f %f %f %f",&a[i][0],&a[i][1],&a[i][2],&a[i][3]);
                     ~^                             ~~~~~~~~
                     %lf
foo.c:21:10: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     b[i]=sqrt(b[i]);
          ^~~~
foo.c:21:10: warning: incompatible implicit declaration of built-in function 'sqrt'
foo.c:21:10: note: include '<math.h>' or provide a declaration of 'sqrt'
foo.c: In function 'main':
foo.c:8:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&m);
   ^~~~~~~~~~~~~~
foo.c: In function 'distance':
foo.c:19:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%f %f %f %f",&a[i][0],&a[i][1],&a[i][2],&a[i][3]);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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