foo.c: In function 'main':
foo.c:11:6: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   11 |    { if(c%a1==0)
      |      ^~
foo.c:14:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   14 |     c=c+1;}
      |     ^
foo.c:5:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    5 |   scanf("%d%d%d%d",&b1,&a1,&b2,&a2);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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