c - When I try to use scanf with 2 arrays I get an error -

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i trying use scanf assign values 2 arrays, 1 x coordinate, , other 1 y, using code that:

for (i1=1;i1<n;i1++) { scanf ("%f%f",&(arx[i1], ary[i1])); }

but when execute error:

prog.c: in function ‘main’: prog.c:11:25: warning: left-hand operand of comma expression has no effect [-wunused-       value] scanf ("%f%f",&(arx[i1], ary[i1]));                      ^ prog.c:11:16: error: lvalue required unary ‘&’ operand scanf ("%f%f",&(arx[i1], ary[i1]));

so don't know doing wrong here, new c

change 

scanf ("%f%f",&(arx[i1], ary[i1])); // not valid syntax

to 

scanf ("%f%f",&arx[i1], &ary[i1]);

you need apply & operator each of arx[i1]and ary[i1] otherwise , in (arx[i1], ary[i1]) interpreted compiler comma operator , hence return r-value. , should know operand of unary & must l-value.


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