Why here in the for loop the initialization is not done and the loop is working fine .in which case can it be done?

#1

int partition(int *a,int s,int e){

int i=s-1;
int j = s;
int pivot = a[e];
for( ;j<e;j++){
    if(a[j]<=pivot){
        i++;
        swap(a[i],a[j]);
    }
}
///Bring the pivot element to its sorted position
swap(a[i+1],a[e]);
return i+1;

}

#2

hi @Agam_virgo j was initialised outside the for loop, you can write the same thing as

for(int j = s ;j<e;j++){
#3

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