foo.c: In function 'main':
foo.c:6:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'scanf'
    6 |         scanf("%d %d",&a,&b);
      |         ^~~~~
foo.c:10:24: error: 'b' undeclared (first use in this function)
   10 |                 if(a*i%b==0)
      |                        ^
foo.c:10:24: note: each undeclared identifier is reported only once for each function it appears in

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