View Compilation Error

0_0_16786488_15452.c: In function 'main':
0_0_16786488_15452.c:12:5: error: 'sm' undeclared (first use in this function)
     sm=sum+1.0/i;
     ^
0_0_16786488_15452.c:12:5: note: each undeclared identifier is reported only once for each function it appears in