Why Does My C Loop Outside a Function Cause a Compiler Error?

Code Placement in C

While writing C code, it's crucial to follow proper structure and organization. One aspect of this is the placement of code within functions.

In your case, you have a code snippet written outside any function. This is not permitted in C . Code must be enclosed within functions, and only declarations and definitions can exist outside of functions.

In particular, you've placed a loop structure outside a function:

int l, k;
for (l = 1; l <= node; l++)
{
    for (k = 1; k <= node; k++)
    {
        flow[i][j] = capacity[i][j];
        flow[j][i] = 0;
     }
}

The compiler error you're encountering indicates that the compiler expects an unqualified identifier before for, and that it expects a constructor, destructor, or type conversion before <= and .

To resolve this issue, you should move the code within a function. For instance, you could create a function called initializeFlow() and place the code there:

void initializeFlow()
{
    int l, k;
    for (l = 1; l <= node; l++)
    {
        for (k = 1; k <= node; k++)
        {
            flow[i][j] = capacity[i][j];
            flow[j][i] = 0;
         }
    }
}

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