# V581. Conditional expressions of 'if' statements located next to each other are identical.

The analyzer detected code where there are two 'if' operators with identical close to each other. This is either a potential error or excessive code.

Consider the following sample:

    if (strlen(S_1) == SIZE)
      Foo(A);
    if (strlen(S_1) == SIZE)
      Foo(B);

Whether this code contains an error or not, depends upon what exactly the programmer intended to do. If the second condition must calculate the length of the other string, then it is an error. This is the correct code:

    if (strlen(S_1) == SIZE)
      Foo(A);
    if (strlen(S_2) == SIZE)
      Foo(B);

Maybe the code is correct, but it is inefficient in this case because it has to calculate the length of one and the same string twice. This is the optimized code:

    if (strlen(S_1) == SIZE) {
      Foo(A);
      Foo(B);
    }

This diagnostic is classified as:

CWE-670

You can look at examples of errors detected by the V581 diagnostic.