foo.c: In function 'chai':
foo.c:55:16: warning: returning 'int *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
   55 |         return fz;
      |                ^~
foo.c:37:29: warning: unused variable 'q' [-Wunused-variable]
   37 |         int i,j,k,l,m,n,o,p,q;
      |                             ^
foo.c: In function 'riqijia':
foo.c:68:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   68 |         if(year % 4==0 && year % 100!=0 || year % 400==0)//闰年
      |            ~~~~~~~~~~~~^~~~~~~~~~~~~~~~
foo.c:164:16: warning: returning 'int *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
  164 |         return riqi;
      |                ^~~~
foo.c: In function 'hwjc':
foo.c:169:15: warning: unused variable 'j' [-Wunused-variable]
  169 |         int i,j,k=0,o=0;
      |               ^
foo.c: In function 'main':
foo.c:196:20: warning: unused variable 'fz2' [-Wunused-variable]
  196 |         int fz1[8],fz2[8],riqi[8];
      |                    ^~~
foo.c:196:13: warning: unused variable 'fz1' [-Wunused-variable]
  196 |         int fz1[8],fz2[8],riqi[8];
      |             ^~~
foo.c:195:29: warning: unused variable 'k' [-Wunused-variable]
  195 |         int date1,date2,i,j,k,couts=0,pd=1;
      |                             ^
foo.c:195:25: warning: unused variable 'i' [-Wunused-variable]
  195 |         int date1,date2,i,j,k,couts=0,pd=1;
      |                         ^
foo.c:201:21: warning: array subscript 8 is above array bounds of 'int[8]' [-Warray-bounds]
  201 |                 riqi[8]=chai(date1,riqi);
      |                 ~~~~^~~
foo.c:196:27: note: while referencing 'riqi'
  196 |         int fz1[8],fz2[8],riqi[8];
      |                           ^~~~
foo.c:212:21: warning: array subscript 8 is above array bounds of 'int[8]' [-Warray-bounds]
  212 |                 riqi[8]=riqijia(riqi);
      |                 ~~~~^~~
foo.c:196:27: note: while referencing 'riqi'
  196 |         int fz1[8],fz2[8],riqi[8];
      |                           ^~~~

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