foo.c: In function 'main':
foo.c:6:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    6 |  { for(j=2;j<=i;j++)
      |    ^~~
foo.c:8:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
    8 |    if(j>=i) k++;
      |    ^~
foo.c:4:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    4 |  scanf("%d",&n);
      |  ^~~~~~~~~~~~~~

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