C ++错误：'int'之前的预期primary-expression

Question

I am getting this error for every int in this section of code;

if(choice==2) {
    inssort(int *a, int numLines);
}
if(choice==3) {
    bubblesort(int *a, int numLines);
}
if(choice==4) {
    mergesort(int *a, int numLines);
}
if(choice==5) {
    radixsort(int *a, int numLines);
}
if(choice==6) {
    return 0;
}

Thats where I call the functions in main. If you are wondering I am writing a small program that gives the user a choice when sorting a list between 4 different types of sorting algorithms.

Any help would be appreciated.

Answer 1

You can't use the declaration types when you're calling the functions. Only when you declare them are they needed:

if(choice==2)
{
    inssort(a, numLines);
}
if(choice==3)
{
    bubblesort(a, numLines);
}
if(choice==4) 
{
    mergesort(a, numLines);
}
if(choice==5) 
{
    radixsort(a, numLines);
}
if(choice==6) 
{
    return 0;
}

Answer 2

You're using function declaration syntax to make function calls . That's not necessary, and (as you have discovered) doesn't even work. You can just write

if (choice == 2)
    inssort(a, numLines);
// etc

By the way, a switch would be more idiomatic here.

Answer 3

if(choice==2)
{
 inssort(int *a, int numLines);
}

your code turn to this

if(choice==2)
{
 inssort(&a, numLines);
}