foo.c: In function 'main':
foo.c:20:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   20 |  scanf("%d %d\n",&b1,&a1);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~
foo.c:21:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   21 |  scanf("%d %d",&b2,&a2);
      |  ^~~~~~~~~~~~~~~~~~~~~~
foo.c: In function 's':
foo.c:8:12: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
    8 |     return m;
      |            ^
foo.c: In function 'z':
foo.c:14:3: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |  n=a*b/i;
      |  ~^~~~~~
foo.c: In function 'main':
foo.c:26:3: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   26 |  j=j/w;
      |  ~^~~~
foo.c:14:3: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |  n=a*b/i;
      |  ~^~~~~~
foo.c:4:6: note: 'm' was declared here
    4 |  int m,i;
      |      ^

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