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There are many possible solutions for this.

1) You can use fflush(stdin). This is not recommended though.
2) You can use getche() instead of scanf.
Example:
gender=getche();
3). Or...

Give some initial value greater than i, that is greater than 1 to split so that loop can be initialized. Change x to any value>i.


int i,split=x,n_split;
float km,n_km;
clrscr();


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