foo.c: In function 'Div':
foo.c:31:7: warning: unused variable 'y' [-Wunused-variable]
 int x,y;               
       ^
foo.c:31:5: warning: unused variable 'x' [-Wunused-variable]
 int x,y;               
     ^
foo.c: In function 'main':
foo.c:8:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&a,&b);
 ^~~~~~~~~~~~~~~~~~~
foo.c:9:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d",&c,&d);
 ^~~~~~~~~~~~~~~~~~~
foo.c:10:5: warning: 'p' is used uninitialized in this function [-Wuninitialized]
 int m=Div(a,b,str,p);
     ^
foo.c:18:5: warning: 't' is used uninitialized in this function [-Wuninitialized]
 int n=Div(c,d,s,t);
     ^

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