foo.c: In function 'main':
foo.c:8:7: warning: implicit declaration of function 'su' [-Wimplicit-function-declaration]
    8 |   jie=su(j);
      |       ^~
foo.c: In function 'su':
foo.c:17:8: warning: unused variable 'ge' [-Wunused-variable]
   17 |  int i,ge,pan;
      |        ^~
foo.c: In function 'main':
foo.c:5:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    5 |  scanf("%d",&n);
      |  ^~~~~~~~~~~~~~

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