/in/foo.c: In function 'main':
/in/foo.c:6:17: warning: missing braces around initializer [-Wmissing-braces]
 int a[100][100]={0,0},x,y,i,j,sum2=0;
                 ^
/in/foo.c:6:17: note: (near initialization for 'a')
/in/foo.c: In function 'five':
/in/foo.c:66:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else
   ^~~~
/in/foo.c:72:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
     return sum;
     ^~~~~~