foo.c: In function ‘main’:
foo.c:27:28: warning: ‘sum’ may be used uninitialized [-Wmaybe-uninitialized]
   27 |                         sum+=1;
      |                         ~~~^~~
foo.c:5:13: note: ‘sum’ was declared here
    5 |         int sum,sspd=0;
      |             ^~~