foo.c: In function 'main':
foo.c:5:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'S'
  int L S T M
        ^
foo.c:5:8: error: unknown type name 'S'
foo.c:5:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'M'
  int L S T M
            ^
foo.c:7:5: error: 'L' undeclared (first use in this function)
  1<=L<=10^9;
     ^
foo.c:7:5: note: each undeclared identifier is reported only once for each function it appears in
foo.c:8:5: error: 'S' undeclared (first use in this function)
  1<=S<=T<=10;1<=M<=100;
     ^
foo.c:8:8: error: 'T' undeclared (first use in this function)
  1<=S<=T<=10;1<=M<=100;
        ^
foo.c:8:17: error: 'M' undeclared (first use in this function)
  1<=S<=T<=10;1<=M<=100;
                 ^

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