foo.c:21:6: error: conflicting types for 'zuidazhi'
 void zuidazhi(int a[],int n)
      ^~~~~~~~
foo.c:7:8: note: previous declaration of 'zuidazhi' was here
    int zuidazhi(int a[],int n);
        ^~~~~~~~
foo.c: In function 'zuidazhi':
foo.c:30:18: error: void value not ignored as it ought to be
         m=a[n-1]>zuidazhi(a,n-1)?a[n-1]:zuidazhi(a,n-1);
                  ^~~~~~~~~~~~~~~
foo.c: In function 'main':
foo.c:5:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&n);
    ^~~~~~~~~~~~~~
foo.c: In function 'shuru':
foo.c:18:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
         ^~~~~~~~~~~~~~~~~

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