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while(current != NULL){
if(current->coef != 0)
printf("%dx%d+",current->coef,current->pow);
current = current->next;
}


Ok, the blue sections are your code and won't...

Why not just write out your values like this?



while(current != NULL){
if(current->coef != 0)
printf("%dx%d+",current->coef,current->pow);
current = current->next;
...