foo.c: In function 'main':
foo.c:7:6: warning: comparison of constant '100' with boolean expression is always true [-Wbool-compare]
  1<=a<=100;
      ^~
foo.c:7:3: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  1<=a<=100;
  ~^~~
foo.c:7:2: warning: statement with no effect [-Wunused-value]
  1<=a<=100;
  ^
foo.c:8:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&a);
  ^~~~~~~~~~~~~~
foo.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%f %f %f %f %f %f %f %f %f %f %f %f %f",&b,&c,&d,&e,&f,&g,&h,&i,&j,&k,&l,&m,&n);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:10:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%f",&r);
  ^~~~~~~~~~~~~~

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