How do I make a function return the first element of a stack ?
I add integer values in my vector size 5 stack.
3
4
5
6
7
You have to return the first element inserted in the stack, in this case the 3rd.
I made this one:
float retornatopo ( struct Pilha *p ){
if(p->topo < 10)
return p->pElem [p->topo - 1];
else
return -1;
}
But this return the top of the stack, I need the first element ( FIFO ).
You can simply do a function that returns the first element this way:
float primeiroElemento ( struct Pilha *p ) {
if( p->topo > 0 )
return p->Elem[0];
return -1;
}
The above function checks for elements in the stack, if any, returns the first. Otherwise it returns -1;
You can do this quietly. But if your goal is to remove the first element and keep the rest of the elements in the same order , I disagree use the function I mentioned. In fact, it only returns the value that is at position 0 on the stack. If you want to remove the element this function is not good.