0_0_35889010_12975.c: In function 'main':
0_0_35889010_12975.c:11:19: error: 'a' undeclared (first use in this function)
scanf("%d",&a);
^
0_0_35889010_12975.c:11:19: note: each undeclared identifier is reported only once for each function it appears in
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